hit counter script
Lenovo ThinkCentre M79 Hardware Maintenance Manual
  1. Manuals
  2. Brands
  3. Lenovo Manuals
  4. Desktop
  5. ThinkCentre M79
  6. Hardware maintenance manual

Lenovo ThinkCentre M79 Hardware Maintenance Manual

Hide thumbs Also See for ThinkCentre M79:
Table of Contents

Advertisement

Quick Links

See also: User Manual
ThinkCentre M79
Hardware Maintenance Manual
Machine Types: 10CT, 10CU, 10CV, and 10CW

Advertisement

Table of Contents
loading

Related Manuals for Lenovo ThinkCentre M79

Summary of Contents for Lenovo ThinkCentre M79

  • Page 1 ThinkCentre M79 Hardware Maintenance Manual Machine Types: 10CT, 10CU, 10CV, and 10CW...
  • Page 2 1 “Read this first: Important safety information” on page 1 and Appendix F “Notices” on page 171. First Edition (July 2014) © Copyright Lenovo 2014. LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant a General Services Administration...

  • Page 3: Table Of Contents

    8.1 operating system ..Chapter 6. Advanced configuration . . 63 An introduction to Lenovo programs ..Using the Setup Utility program ..
  • Page 4 Diagnostics ....Replacing the front audio and USB Lenovo Solution Center ..assembly ....
  • Page 5 Safety and Warranty... Recycling information for Brazil ..Lenovo Web site ... . Battery recycling information for Taiwan ..
  • Page 6 ThinkCentre M79 Hardware Maintenance Manual...

  • Page 7: About This Manual

    Use this manual along with the advanced diagnostic tests to troubleshoot problems effectively. Before servicing a ThinkCentre computer, be sure to read and understand Chapter 1 “Read this first: Important safety information” on page 1. © Copyright Lenovo 2014...
  • Page 8 ThinkCentre M79 Hardware Maintenance Manual...

  • Page 9: Chapter 1. Read This First: Important Safety Information

    • Do not perform any action that causes hazards to the customer, or that makes the equipment unsafe. • Before you start the machine, ensure that other service representatives and the customer's personnel are not in a hazardous position. © Copyright Lenovo 2014...

  • Page 10: Electrical Safety

    – Use only one hand when working with powered-on electrical equipment; keep the other hand in your pocket or behind your back. Remember: There must be a complete circuit to cause electrical shock. By observing the above rule, you may prevent a current from passing through your body. ThinkCentre M79 Hardware Maintenance Manual...

  • Page 11: Safety Inspection Guide

    – When using a tester, set the controls correctly and use the approved probe leads and accessories for that tester. – Stand on suitable rubber mats (obtained locally, if necessary) to insulate you from grounds such as metal floor strips and machine frames. Observe the special safety precautions when you work with very high voltages;...

  • Page 12: Handling Electrostatic Discharge-Sensitive Devices

    – Use the round ground-prong of the ac plug on ac-operated computers. Grounding requirements Electrical grounding of the computer is required for operator safety and correct system function. Proper grounding of the electrical outlet can be verified by a certified electrician. ThinkCentre M79 Hardware Maintenance Manual...

  • Page 13: Safety Notices (Multi-Lingual Translations)

    Safety notices (multi-lingual translations) The caution and danger safety notices in this section are provided in the following languages: • English • Arabic • Brazilian/Portuguese • Chinese (simplified) • Chinese (traditional) • French • German • Hebrew • Italian • Korean •...
  • Page 14 The power control button on the device and the power switch on the power supply do not turn off the electrical current supplied to the device. The device also might have more than one power ThinkCentre M79 Hardware Maintenance Manual...
  • Page 15 cord. To remove all electrical current from the device, ensure that all power cords are disconnected from the power source. Chapter 1 Read this first: Important safety information...
  • Page 16 ≥18 kg (37 lb) ≥32 kg (70.5 lb) ≥55 kg (121.2 lb) ThinkCentre M79 Hardware Maintenance Manual...
  • Page 17 PERIGO A corrente elétrica proveniente de cabos de alimentação, de telefone e de comunicações é perigosa. Para evitar risco de choque elétrico: • Não conecte nem desconecte nenhum cabo ou execute instalação, manutenção ou reconfiguração deste produto durante uma tempestade com raios. •...
  • Page 18 O dispositivo também pode ter mais de um cabo de alimentação. Para remover toda a corrente elétrica do dispositivo, assegure que todos os cabos de alimentação estejam desconectados da fonte de alimentação. ThinkCentre M79 Hardware Maintenance Manual...
  • Page 19 Chapter 1 Read this first: Important safety information...
  • Page 20 ThinkCentre M79 Hardware Maintenance Manual...
  • Page 21 Chapter 1 Read this first: Important safety information...
  • Page 22 (sauf instruction contraire mentionnée dans les procédures d'installation et de configuration). • Lorsque vous installez, que vous déplacez, ou que vous manipulez le présent produit ou des périphériques qui lui sont raccordés, reportez-vous aux instructions ci-dessous pour connecter et déconnecter les différents cordons. ThinkCentre M79 Hardware Maintenance Manual...
  • Page 23 Connexion Déconnexion 1. Mettez les unités HORS TENSION. 1. Mettez les unités HORS TENSION. 2. Commencez par brancher tous les cordons sur les 2. Débranchez les cordons d'alimentation des prises. unités. 3. Débranchez les câbles d'interface des connecteurs. 3. Branchez les câbles d'interface sur des connecteurs. 4.
  • Page 24 Schutzkontakt anschließen. • Die Signalkabel nach Möglichkeit einhändig anschließen oder lösen, um einen Stromschlag durch Berühren von Oberflächen mit unterschiedlichem elektrischem Potenzial zu vermeiden. • Geräte niemals einschalten, wenn Hinweise auf Feuer, Wasser oder Gebäudeschäden vorliegen. ThinkCentre M79 Hardware Maintenance Manual...
  • Page 25 • Die Verbindung zu den angeschlossenen Netzkabeln, Telekommunikationssystemen, Netzwerken und Modems ist vor dem Öffnen des Gehäuses zu unterbrechen, sofern in den Installations- und Konfigurationsprozeduren keine anders lautenden Anweisungen enthalten sind. • Zum Installieren, Transportieren und Öffnen der Abdeckungen des Computers oder der angeschlossenen Einheiten die Kabel gemäß...
  • Page 26 Mit dem Netzschalter an der Einheit und am Netzteil wird die Stromversorgung für die Einheit nicht unterbrochen. Die Einheit kann auch mit mehreren Netzkabeln ausgestattet sein. Um die Stromversorgung für die Einheit vollständig zu unterbrechen, müssen alle zum Gerät führenden Netzkabel vom Netz getrennt werden. ThinkCentre M79 Hardware Maintenance Manual...
  • Page 27 Chapter 1 Read this first: Important safety information...
  • Page 28 • Non collegare o scollegare qualsiasi cavo oppure effettuare l'installazione, la manutenzione o la riconfigurazione del prodotto durante un temporale. • Collegare tutti i fili elettrici a una presa di alimentazione correttamente cablata e dotata di messa a terra. ThinkCentre M79 Hardware Maintenance Manual...
  • Page 29 • Collegare alle prese elettriche appropriate tutte le apparecchiature che verranno utilizzate per questo prodotto. • Se possibile, utilizzare solo una mano per collegare o scollegare i cavi di segnale. • Non accendere assolutamente apparecchiature in presenza di incendi, perdite d'acqua o danno strutturale.
  • Page 30 Il pulsante di controllo dell'alimentazione presente sull'unità e l'interruttore dell'alimentatore non disattivano l'alimentazione corrente fornita all'unità. E' possibile che l'unità disponga di più cavi di alimentazione. Per disattivare l'alimentazione dall'unità, accertarsi che tutti i cavi di alimentazione siano scollegati dalla fonte di alimentazione. ThinkCentre M79 Hardware Maintenance Manual...
  • Page 31 Chapter 1 Read this first: Important safety information...
  • Page 32 • Cualquier equipo que se conecte a este producto también debe conectarse a tomas de corriente debidamente cableadas. • Siempre que sea posible, utilice una sola mano para conectar o desconectar los cables de señal. • No encienda nunca un equipo cuando hay señales de fuego, agua o daños estructurales. ThinkCentre M79 Hardware Maintenance Manual...
  • Page 33 • Desconecte los cables de alimentación, los sistemas de telecomunicaciones, las redes y los módems conectados antes de abrir las cubiertas de los dispositivos, a menos que se indique lo contrario en los procedimientos de instalación y configuración. • Conecte y desconecte los cables, como se describe en la tabla siguiente, cuando instale, mueva o abra las cubiertas de este producto o de los dispositivos conectados.
  • Page 34 Además, el dispositivo podría tener más de un cable de alimentación. Para suprimir toda la corriente eléctrica del dispositivo, asegúrese de que todos los cables de alimentación estén desconectados de la toma de corriente. ThinkCentre M79 Hardware Maintenance Manual...

  • Page 35: Chapter 2. Product Overview

    • Locations of parts on the system board • Locations of internal drives • Computer features • Software programs provided by Lenovo Locations This section provides the following topics: • “Locating connectors, controls, and indicators on the front of your computer” on page 28 •...

  • Page 36: Locating Connectors, Controls, And Indicators On The Front Of Your Computer

    Figure 1. Front connector, control, and indicator locations Power button Optical drive eject/close button Power indicator Hard disk drive activity indicator USB 2.0 connector (USB connector 2) Microphone connector Headphone connector USB 2.0 connector (USB connector 1) ThinkCentre M79 Hardware Maintenance Manual...

  • Page 37: Locating Connectors On The Rear Of Your Computer

    Locating connectors on the rear of your computer The following illustration shows the locations of the connectors on the rear of your computer. Some connectors on the rear of your computer are color-coded to help you determine where to connect the cables on your computer.
  • Page 38 USB 3.0 connector provides high transmission speeds to reduce the time that is required for data transmission. VGA connector Used to attach a VGA monitor or other devices that use a Video Graphics Array (VGA) connector. ThinkCentre M79 Hardware Maintenance Manual...

  • Page 39: Locating Components

    Locating components The following illustration shows the locations of the various components in your computer. To remove the computer cover, see “Removing the computer cover” on page 105. Figure 3. Component locations Heat sink and fan assembly Power supply assembly Memory modules Optical drive Front audio and USB assembly...
  • Page 40 Figure 4. Component locations ThinkCentre M79 Hardware Maintenance Manual...
  • Page 41 The following table lists the major FRUs shown in Figure 4 “Component locations” on page 32 and identifies which FRUs also are self-service CRUs or optional-service CRUs. Notes: • Self-service CRUs: These CRUs unplug or are secured by no more than two screws. Examples of these types of CRUs include the keyboard, the mouse, any USB device, and the power cord.

  • Page 42: Locating Parts On The System Board

    Clear CMOS (Complementary Metal Oxide Semiconductor) additional USB device) /Recovery jumper Serial connector Battery Front audio connector PCI card slot PCI Express x1 card slots (2) PCI Express x16 graphics card slot DisplayPort connector System fan connector Microprocessor ThinkCentre M79 Hardware Maintenance Manual...

  • Page 43: Locating Internal Drives

    Locating internal drives Internal drives are devices that your computer uses to read and store data. You can add drives to your computer to increase storage capacity and enable your computer to read other types of media. Internal drives are installed in bays. When you install or replace an internal drive, note the type and size of the drive that each bay supports and correctly connect the required cables.

  • Page 44: Locating The Machine Type And Model Label

    Locating the machine type and model label The machine type and model label identifies your computer. When you contact Lenovo for help, the machine type and model information helps support technicians to identify your computer and provide faster service. The machine type and model label is attached on the side of your computer as shown.
  • Page 45 • On the Microsoft Windows 8.1 operating system, go to the desktop and move your pointer to the top-right or bottom-right corner of the screen to display the charms. Then click Settings ➙ PC info to view the information. For more information, see “Installing or replacing a memory module” on page 109. Internal drives •...
  • Page 46 • Windows Management Instrumentation (WMI) Windows Management Instrumentation is a set of extensions to the Windows Driver Model. It provides an operating system interface through which instrumented components provide information and notification. ThinkCentre M79 Hardware Maintenance Manual...
  • Page 47 The operating system(s) listed here are being certified or tested for compatibility at the time this publication goes to press. Additional operating systems might be identified by Lenovo as compatible with your computer following the publication of this manual. This list is subject to change. To determine if an operating system has been certified or tested for compatibility, check the Web site of the operating system vendor.

  • Page 48: Specifications

    Control Panel. The icon name displayed in the search result or Control Panel might be different from the program name. You can find the program by its program name or icon name as shown in the Lenovo programs available on the Windows 7 operating system table.

  • Page 49: Accessing Lenovo Programs On The Windows 8.1 Operating System

    Press the Windows key to go to the Start screen. Click a Lenovo program to launch it. If you cannot find the program you need, click the arrow icon in the bottom-left corner of the screen to go to the Apps screen.

  • Page 50: An Introduction To Lenovo Programs

    As a result, you can access, edit, and share your files from anywhere. With Lenovo Reach, you also can add your favorite Web services to your cloud desktop and stay logged-in to Web sites with the cloud password manager.
  • Page 51 • Lenovo SHAREit (Windows 7 and Windows 8.1) The Lenovo SHAREit program provides a quick and easy way to share files and folders among computers, smartphones, tablets, or smart TVs with the Android or the Windows operating system installed. SHAREit uses any type of network or even no network at all to share files and folders.
  • Page 52 (such as your smartphone and tablet) on the computer with no need to use cables or a network connection. To achieve this, your computer must be equipped with a Realtek Wi-Fi card and has the Wifi Display Receiver program installed. ThinkCentre M79 Hardware Maintenance Manual...

  • Page 53: Chapter 3. Using Your Computer

    When you register your computer, information is entered into a database, which enables Lenovo to contact you in case of a recall or other severe problem. After you register your computer with Lenovo, you will receive quicker service when you call Lenovo for help. In addition, some locations offer extended privileges and services to registered users.

  • Page 54: Using The Fingerprint Reader

    To open Fingerprint Manager Pro or ThinkVantage Fingerprint Software and use the fingerprint reader, do the following: • On the Windows 7 operating system, see “Accessing Lenovo programs on the Windows 7 operating system” on page 40. • On the Windows 8.1 operating system, see “Accessing Lenovo programs on the Windows 8.1 operating system”...

  • Page 55: Advanced Configuration And Power Interface (Acpi) Bios

    Advanced configuration and power interface (ACPI) BIOS Being an ACPI BIOS system, the operating system is allowed to control the power management features of the computer and the setting for Advanced Power Management (APM) BIOS mode is ignored. Not all operating systems support ACPI BIOS mode. Automatic Power-on features The Automatic Power-On features within the Power Management menu allow you to enable and disable features that turn on the computer automatically.

  • Page 56: Setting The Volume From Control Panel

    – High temperature – High humidity – Excessive dust – Excessive vibration or sudden shock – An inclined surface – Direct sunlight • Do not insert any object other than a disc into the drive. ThinkCentre M79 Hardware Maintenance Manual...

  • Page 57: Handling And Storing A Disc

    If your computer is installed with a recordable optical drive, you can use the drive to record a disc. To record a disc, do the following: • On the Windows 7 operating system, use either the Corel DVD MovieFactory Lenovo Edition program or the Power2Go program installed on your computer.

  • Page 58: Navigating Among Screens On The Windows 8.1 Operating System

    • Move the pointer to the extreme bottom-left corner of the screen and then move the pointer upward along the left edge of the screen. Representations of all available workspaces are displayed along the left edge of the screen. ThinkCentre M79 Hardware Maintenance Manual...

  • Page 59: Accessing Control Panel On The Windows 8.1 Operating System

    For the answers to more frequently asked questions about using your computer, go to: http://www.lenovo.com/support/faq How can I get my user guide in another language? The user guide is available in various languages at: http://www.lenovo.com/UserManuals...
  • Page 60 Chapter 10 “Recovery information” on page 97. Additionally, in case of a hard-disk-drive failure, you can order a recovery disc set from the Lenovo Customer Support Center. For information about contacting the Customer Support Center, see Chapter 12 “Getting information, help, and service”...

  • Page 61: Chapter 4. You And Your Computer

    51–61 cm (20–24 inches). Then, position the monitor so that you can view it without twisting your body. Also, position other equipment you use regularly, such as the telephone or a mouse, within easy reach. © Copyright Lenovo 2014...

  • Page 62: Glare And Lighting

    For more information about power cords, see “Power cords and power adapters” on page 1. Accessibility information Lenovo is committed to providing people with disabilities greater access to information and technology. Some technologies are already provided in your operating system. Others can be purchased through vendors.
  • Page 63 On-screen notification On-screen notification helps hearing-impaired people be aware of the status of their computer. On-screen notification replaces sounds with visual cues or text captions to indicate that activity is happening on the computer. As a result, system alerts are noticeable even when they are not heard. For example, when you select one object with your keyboard, the object is highlighted.
  • Page 64 Screen resolution, and then adjust the settings as you prefer. Note: Setting too low of a resolution might prevent some items from fitting on the screen. For alternatives on increasing the size of text and other objects, see the following: ThinkCentre M79 Hardware Maintenance Manual...
  • Page 65 • “Customizable text size” on page 56 • “Magnifier” on page 56 • “Zoom” on page 56 Ease of Access keyboard shortcuts The following table contains keyboard shortcuts that can help make your computer easier to use. Keyboard shortcut Function Windows logo key + U Open the Ease of Access Center Right Shift for eight seconds...

  • Page 66: Moving Your Computer To Another Country Or Region

    Then, you can type a message on your computer and send it to the telephone. Documentation in accessible formats Lenovo provides electronic documentation in accessible formats, such as properly tagged PDF files or HyperText Markup Language (HTML) files. Lenovo electronic documentation is developed to ensure that visually impaired users can read the documentation through a screen reader.

  • Page 67: Chapter 5. Security

    Locking the computer cover helps prevent unauthorized people from gaining access to the inside of your computer. Your computer comes with a padlock loop so that the computer cover cannot be removed when a padlock is installed. © Copyright Lenovo 2014...
  • Page 68 Figure 8. Installing a padlock ThinkCentre M79 Hardware Maintenance Manual...

  • Page 69: Attaching A Kensington-Style Cable Lock

    The cable lock also locks the buttons used to open the computer cover. This is the same type of lock used with many notebook computers. You can order such a cable lock directly from Lenovo by searching for Kensington at: http://www.lenovo.com/support Figure 9.

  • Page 70: Windows Passwords

    Your computer is preinstalled with an antivirus program to help you guard against, detect, and eliminate viruses. Lenovo provides a full version of antivirus software on your computer with a free 30-day subscription. After 30 days, you must renew the license to continue receiving the antivirus software updates.

  • Page 71: Chapter 6. Advanced Configuration

    Setup Utility program. See “Starting the Setup Utility program” on page 63. Then, follow the instructions on the screen. You can use either the keyboard or the mouse to navigate through menu choices. The keys used to perform various tasks are displayed at the bottom of each screen. © Copyright Lenovo 2014...

  • Page 72: Using Bios Passwords

    To set, change, or delete a password, do the following: 1. Start the Setup Utility program. See “Starting the Setup Utility program” on page 63. 2. From the Setup Utility program main menu, select Security. ThinkCentre M79 Hardware Maintenance Manual...

  • Page 73: Enabling Or Disabling A Device

    3. Depending on the password type, select Set Power-On Password, Set Administrator Password, or Hard Disk Password. 4. Follow the instructions on the right side of the screen to set, change, or delete a password. Note: A password can be any combination of up to 64 alphabetic and numeric characters. For more information, see “Password considerations”...

  • Page 74: Selecting A Startup Device

    68. Enabling ErP LPS compliance mode Lenovo computers meet the eco-design requirements of the ErP Lot 3 regulation. For more information, go http://www.lenovo.com/ecodeclaration You can enable ErP LPS compliance mode in the Setup Utility program to reduce the consumption of electricity when your computer is off or in sleep mode.

  • Page 75: Ice Performance Mode

    The wake up on alarm feature enables your computer to wake up at a set time. To enable the wake up on alarm feature, do the following: 1. Start the Setup Utility program. 2. From the Setup Utility program main menu, select Power ➙ Automatic Power On, and press Enter. 3.

  • Page 76: Exiting The Setup Utility Program

    Setup Utility program. Updating or recovering the BIOS Lenovo might make changes and enhancements to the BIOS. When updates are released, they are available as downloadable files on the Lenovo Web site at http://www.lenovo.com/drivers. Instructions for using the BIOS updates are available in a TXT file that is included with the update files.

  • Page 77: Changing The Bios Settings Before Installing A New Operating System

    Lenovo might make changes and enhancements to the POST and BIOS. When updates are released, they are available as downloadable files on the Lenovo Web site at http://www.lenovo.com. Instructions for using the POST and BIOS updates are available in a TXT file that is included with the update files.

  • Page 78: Updating The Bios From Your Operating System

    Updating the BIOS from your operating system Lenovo makes constant improvements to its Web sites. The Web page contents are subject to change without notice, including the contents referenced in the following procedure. To update the BIOS from your operating system, do the following: 1.
  • Page 79 4. Remove any cables that impede access to the Clear CMOS /Recovery jumper. 5. Move the jumper from the standard position (pin 1 and pin 2) to the maintenance position (pin 2 and pin 3). 6. Reconnect any cables that were disconnected and reinstall the PCI card if removed. 7.
  • Page 80 ThinkCentre M79 Hardware Maintenance Manual...

  • Page 81: Chapter 7. Preventing Problems

    This section explains how to get the latest updates for your computer. Getting the latest device drivers for your computer Note: Lenovo makes constant improvements to its Web sites. The contents on the Web page are subject to change without notice, including the contents referenced in the following procedure.

  • Page 82: Using The System Update Program

    To open System Update, see “Accessing Lenovo programs on the Windows 7 operating system” on page 40 or “Accessing Lenovo programs on the Windows 8.1 operating system” on page 41. If System Update is not currently installed on your computer, you can download it from the Lenovo Support Web site at: http://www.lenovo.com/support...

  • Page 83: Good Maintenance Practices

    1. Apply some isopropyl rubbing alcohol to a soft, dust-free cloth. 2. Wipe each keytop surface with the cloth. Wipe the keys one by one; if you wipe several keys at a time, the cloth may hook onto an adjacent key and possibly damage it. Ensure that no liquid drips onto or between the keys.

  • Page 84: Moving Your Computer

    The cause of a problem might be change in hardware, change in software, or any other actions that might have taken place. A log book can help you or a Lenovo technician determines the cause of a problem. • Create Product Recovery discs. See “Creating and using recovery media” on page 97 for more information about using Product Recovery discs to restore the hard disk drive to the factory-default settings.

  • Page 85: Chapter 8. Troubleshooting And Diagnostics

    Note: If you cannot correct the problem, have the computer serviced. For a list of service and support telephone numbers, refer to the Safety, Warranty, and Setup Guide that comes with your computer or go to the Lenovo Support Web site at: http://www.lenovo.com/support/phone...

  • Page 86: Troubleshooting Procedure

    If this does not correct the problem, continue with the next step. 6. Run the diagnostic program. See “Lenovo Solution Center” on page 88 for more information. • If the diagnostic program detects a hardware failure or if you are unable to run the diagnostic program, contact the Lenovo Customer Support Center.

  • Page 87: Audio Problems

    1. Remove the new hardware option or software. If you must remove the computer cover to remove a hardware option, ensure that you review and follow the electrical safety information provided with your computer. For your safety, do not operate the computer with the cover removed. 2.

  • Page 88: Dvd Problems

    • Use the DVD menu for the video to select a different audio track. Playback is slow or choppy Solutions: • Disable any background programs, such as AntiVirus or Desktop Themes. • Ensure that video resolution is set to less than 1152 x 864 pixels. ThinkCentre M79 Hardware Maintenance Manual...

  • Page 89: Intermittent Problems

    (one to five hard disk drives) or the LSI MegaRAID SAS adapter is installed. If these actions do not correct the problem, run the diagnostic program Lenovo Solution Center. See “Lenovo Solution Center” on page 88. If you need technical assistance, see Chapter 12 “Getting information, help, and service”...

  • Page 90: Problems With The Keyboard Or Mouse

    Refer to “Replacing the hard disk drive” on page 114. If these actions do not correct the problem, run the diagnostic program Lenovo Solution Center. See “Lenovo Solution Center” on page 88.

  • Page 91: Monitor Problems

    • Enroll your fingerprint correctly. • Never scratch the surface of the reader with a hard, pointed object. • Never scrap the surface of the reader with your nail or anything hard. • Use or touch the reader with a clean finger. •...

  • Page 92: Networking Problems

    Solution: The network driver files might be corrupt or missing. Update the driver by referring to the “Solution” description for the previous problem to ensure that the latest device driver is installed. The Wake On LAN feature is not working Solution: Enable the Wake On LAN (WOL) feature in the BIOS program. ThinkCentre M79 Hardware Maintenance Manual...
  • Page 93 • Check Network Name (SSID) and your password. – On Windows 7: 1. Click Start ➙ Lenovo ThinkVantage Tools ➙ Access Connections. 2. Switch to the Advanced view, and then click the Mobile Hotspot tab to check your SSID and password.

  • Page 94: I Have Connected An Option To My Computer, But It Does Not Work

    3. Right-click your C drive entry and then click Properties. 4. Click Defragment now under the Tools tab to start a disk-defragmentation process. • On Windows 8.1: 1. Close any open programs and windows. 2. Open File Explorer. ThinkCentre M79 Hardware Maintenance Manual...

  • Page 95: The Printer Does Not Work

    Solution: Install additional memory modules. For instructions on installing memory modules, see “Installing or replacing a memory module” on page 109. To purchase memory modules, go to: http://www.lenovo.com The printer does not work Solutions: • If you are using IEEE-approved printer signal cables, do the following: 1.

  • Page 96: My Usb Connectors Cannot Be Accessed

    Windows operating system. Notes: 1. Your computer is preinstalled with the Lenovo Solution Center program for diagnostic purposes. For more information about the Lenovo Solution Center program, see “Lenovo Solution Center” on page 88. 2. If you are unable to isolate and repair the problem yourself after running the diagnostic program, save and print the log files created by the diagnostic program.

  • Page 97: Uefi Diagnostic Program

    Note: If you cannot isolate and repair the problem yourself after running the program, save and print the log files. You will need the log files when you speak to a Lenovo technical support representative. For additional information, refer to the Lenovo Solution Center help system.
  • Page 98 ThinkCentre M79 Hardware Maintenance Manual...

  • Page 99: Chapter 9. Service Checkout And Symptom-To-Fru Index

    If possible, have this information available when requesting assistance from Service Support and Engineering functions. • Machine type and model • Processor or hard disk drive upgrades • Failure symptom – Do diagnostics indicate a failure? © Copyright Lenovo 2014...

  • Page 100: Symptom-To-Fru Index

    • If you did not receive any error message, look for a description of your error symptoms in the first part of this index. Hard disk drive boot error A hard disk drive boot error can have the following causes. ThinkCentre M79 Hardware Maintenance Manual...

  • Page 101: Power Supply Problems

    Error FRU/Action The start-up drive is not in the boot sequence in Check the configuration and ensure the start-up drive is configuration. in the boot sequence. No operating system installed on the boot drive. Install an operating system on the boot drive. The boot sector on the startup drive is corrupted.

  • Page 102: Miscellaneous Error Conditions

    1. Ensure that network is in startup sequence as first device or first device after diskette. 2. Ensure that network adapter is enabled for RPL. 3. Network adapter (Advise network administrator of new MAC address) ThinkCentre M79 Hardware Maintenance Manual...
  • Page 103 Message/Symptom FRU/Action ® Computer will not perform a Wake On LAN (if applicable) 1. Check power supply and signal cable connections to network adapter. 2. Ensure that the operating system settings are set to enable Wake on LAN. 3. Ensure Wake On LAN feature is enabled in Setup/Configuration (see “Starting the Setup Utility program”...

  • Page 104: Undetermined Problems

    4. Repeat steps 1 through 3 until you find the failing device or adapter. If all devices and adapters have been removed, and the problem continues, replace the system board. See “Replacing the system board” on page 135. ThinkCentre M79 Hardware Maintenance Manual...

  • Page 105: Chapter 10. Recovery Information

    Product Recovery program installed. If the Enhanced Backup and Restore icon in the Lenovo ThinkVantage Tools program is dimmed, it indicates that you must install the Rescue and Recovery program manually before enabling its features. To install the Rescue and Recovery program, do the following: 1.

  • Page 106: Performing Backup And Recovery Operations

    Note: On the Windows 7 operating system, you can create recovery media using discs or external USB storage devices. To create recovery media on the Windows 7 operating system, click Start ➙ All Programs ➙ Lenovo ThinkVantage Tools ➙ Factory Recovery Disks. Then, follow the instructions on the screen.
  • Page 107 To perform a recovery operation using the Rescue and Recovery program on the Windows 7 operating system, do the following: 1. From the Windows desktop, click Start ➙ All Programs ➙ Lenovo ThinkVantage Tools ➙ Enhanced Backup and Restore. The Rescue and Recovery program opens.

  • Page 108: Creating And Using A Rescue Medium

    Creating a rescue medium To create a rescue medium on the Windows 7 operating system, do the following: 1. From the Windows desktop, click Start ➙ All Programs ➙ Lenovo ThinkVantage Tools ➙ Enhanced Backup and Restore. The Rescue and Recovery program opens.

  • Page 109: Reinstalling Preinstalled Programs And Device Drivers

    Reinstalling preinstalled programs and device drivers Your computer enables you to reinstall preinstalled programs and device drivers. Reinstalling preinstalled programs To reinstall programs preinstalled on your Lenovo computer, do the following: 1. Turn on the computer. 2. Go to C:\SWTOOLS.

  • Page 110: Solving Recovery Problems

    Attention: If you reset your computer, all your personal files and settings will be deleted. To avoid data loss, make a backup copy of all the data that you want to keep. To reset your computer, do the following: ThinkCentre M79 Hardware Maintenance Manual...

  • Page 111: Using The Advanced Startup Options

    1. Move the pointer to the top-right or bottom-right corner of the screen to display the charms. Click Settings ➙ Change PC settings ➙ Update and recovery ➙ Recovery. 2. In the Remove everything and reinstall Windows section, click Get started. Using the advanced startup options Advanced startup options enable you to change the startup settings of your Windows operating system, start the computer from an external device, or restore the Windows operating system from a system image.
  • Page 112 ThinkCentre M79 Hardware Maintenance Manual...

  • Page 113: Chapter 11. Installing Or Replacing Hardware

    1 “Read this first: Important safety information” on page 1. Notes: • Use only computer parts provided by Lenovo. • When installing or replacing an option, use the appropriate instructions in this section along with the instructions that come with the option.

  • Page 114: Removing And Reinstalling The Front Bezel

    1. Remove any media from the drives and turn off all attached devices and the computer. Then, disconnect all power cords from electrical outlets and disconnect all cables that are connected to the computer. 2. Remove the computer cover. See “Removing the computer cover” on page 105. ThinkCentre M79 Hardware Maintenance Manual...
  • Page 115 3. Remove the front bezel by releasing the three plastic tabs on the top of the front bezel and pivoting the front bezel outward to remove it from the computer. Carefully lay the front bezel aside without disconnecting the power switch and light-emitting diode (LED) assembly cable. Figure 11.

  • Page 116: Accessing The System Board Components And Drives

    3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 106. 4. Pivot the drive bay assembly upward to access all the internal drives, cables, and other components. Figure 13. Pivoting the drive bay assembly upward ThinkCentre M79 Hardware Maintenance Manual...

  • Page 117: Installing Or Replacing A Memory Module

    5. To lower the drive bay assembly, slightly press the drive bay assembly clip inward and pivot the drive bay assembly downward as shown. Figure 14. Lowering the drive bay assembly Installing or replacing a memory module Attention: Do not open your computer or attempt any repair before reading and understanding the Chapter 1 “Read this first: Important safety information”...
  • Page 118 Figure 15. Removing a memory module • If you are installing a memory module, open the retaining clips of the memory slot into which you want to install the memory module. Figure 16. Opening the retaining clips ThinkCentre M79 Hardware Maintenance Manual...

  • Page 119: Installing Or Replacing A Pci Card

    8. Position the new memory module over the memory slot. Make sure that the notch on the memory module aligns correctly with the slot key on the system board. Push the memory module straight down into the slot until the retaining clips close. Figure 17.
  • Page 120 Grasp the card and gently pull it out of the slot. • If you are installing a PCI card, remove the screw that secures the appropriate metal slot cover. Then, remove the metal slot cover. 6. Remove the new PCI card from its static-protective package. ThinkCentre M79 Hardware Maintenance Manual...

  • Page 121: Replacing The Battery

    7. Install the new PCI card into the appropriate PCI card slot on the system board. Then, install the screw to secure the new PCI card in place. Figure 19. Installing a PCI card 8. If necessary, connect any cables between the PCI card and the system board. See “Locating parts on the system board”...

  • Page 122: Replacing The Hard Disk Drive

    2. Remove the computer cover. See “Removing the computer cover” on page 105. 3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 106. ThinkCentre M79 Hardware Maintenance Manual...
  • Page 123 4. Note the location of the four screws that secure the hard disk drive. Then, pivot the drive bay assembly upward. Figure 22. Pivoting the drive bay assembly 5. Hold the hard disk drive and remove the four screws that secure the hard disk drive. Then, remove the hard disk drive from the drive bay assembly.

  • Page 124: Replacing The Solid-State Drive

    117. • To replace the solid-state drive on the bottom of the optical drive bay, see “Replacing the solid-state drive on the bottom of the optical drive bay” on page 118. ThinkCentre M79 Hardware Maintenance Manual...
  • Page 125 Replacing the solid-state drive in the hard disk drive bay To replace the storage converter with the solid-state drive installed in it, you might follow the steps of replacing the hard disk drive. See “Replacing the hard disk drive” on page 114. To replace the solid-state drive in the storage converter, do the following: 1.
  • Page 126 3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 106. 4. Pivot the drive bay assembly upward. See “Accessing the system board components and drives” on page 108. 5. Disconnect the signal cable and the power cable from the solid-state drive. ThinkCentre M79 Hardware Maintenance Manual...
  • Page 127 6. Remove the screw and then carefully slide the solid-state drive bracket upward to remove the bracket from the bottom of the optical drive bay. Figure 28. Removing the solid-state drive bracket 7. Remove the four screws that secure the solid-state drive to the bracket. Then, slide the drive as shown to remove it from the bracket.
  • Page 128 Figure 30. Installing the solid-state drive into the bracket 10. Carefully slide the solid-state drive bracket downward until it is secured by the three retaining clips the bottom of the optical drive bay. Figure 31. Installing the solid-state drive bracket ThinkCentre M79 Hardware Maintenance Manual...

  • Page 129: Installing Or Replacing The Optical Drive

    11. Install the screw to secure the bracket on the bottom of the optical drive bay. Figure 32. Installing the screw to secure the bracket on the bottom of the optical drive bay 12. Connect one end of the signal cable to the bottom of the new solid-state drive and the other end to an available SATA connector on the system board.
  • Page 130 6. Hold the optical drive and remove the two screws that secure the optical drive. Figure 33. Removing the optical drive screws 7. Slightly press the drive bay assembly clip inward and pivot the drive bay assembly downward as shown. Figure 34. Lowering the drive bay assembly ThinkCentre M79 Hardware Maintenance Manual...
  • Page 131 8. Slide the optical drive out of the front of the computer. Figure 35. Removing the optical drive 9. Slide the new optical drive into the optical drive bay from the front of the computer. Figure 36. Installing a new optical drive Chapter 11 Installing or replacing hardware...

  • Page 132: Replacing The Slim Card Reader

    Attention: Do not open your computer or attempt any repair before reading and understanding the Chapter 1 “Read this first: Important safety information” on page 1. Note: The slim card reader is only available on some models. To replace the slim card reader, do the following: ThinkCentre M79 Hardware Maintenance Manual...
  • Page 133 1. Remove any media from the drives and turn off all attached devices and the computer. Then, disconnect all power cords from electrical outlets and disconnect all cables that are connected to the computer. 2. Remove the computer cover. See “Removing the computer cover” on page 105. 3.

  • Page 134: Replacing The Heat Sink And Fan Assembly

    • To complete the installation or replacement, go to “Completing the parts replacement” on page 151. Replacing the heat sink and fan assembly Attention: Do not open your computer or attempt any repair before reading and understanding the Chapter 1 “Read this first: Important safety information” on page 1. ThinkCentre M79 Hardware Maintenance Manual...
  • Page 135 CAUTION: The heat sink and fan assembly might be very hot. Turn off the computer and wait three to five minutes to let the computer cool before removing the computer cover. To replace the heat sink and fan assembly, do the following: 1.
  • Page 136 , and then fully tighten screw 9. Connect the new heat sink and fan assembly cable to the microprocessor fan connector on the system board. See “Locating parts on the system board” on page 34. ThinkCentre M79 Hardware Maintenance Manual...

  • Page 137: Replacing The Power Supply Assembly

    10. Lower and position the heat sink fan duct on the top of the heat sink and fan assembly until it snaps into position. Figure 45. Installing the heat sink fan duct What to do next: • To work with another piece of hardware, go to the appropriate section. •...
  • Page 138 Note: You might also need to release the power supply assembly cables from some cable clips or ties that secure the cables to the chassis. Ensure that you note the cable routing before disconnecting the cables. ThinkCentre M79 Hardware Maintenance Manual...
  • Page 139 Then, install the three screws to secure the new power supply assembly in place. Note: Use only screws provided by Lenovo. Figure 48. Installing the power supply assembly...

  • Page 140: Replacing The Microprocessor

    4. Remove the heat sink and fan assembly with the fan duct. See “Replacing the heat sink and fan assembly” on page 126. Note: Place the heat sink and fan assembly on its side so that the thermal grease on the bottom of it does not get in contact with anything. ThinkCentre M79 Hardware Maintenance Manual...
  • Page 141 5. Lift the small handle to release the microprocessor secured on the system board. Figure 50. Accessing the microprocessor Chapter 11 Installing or replacing hardware...
  • Page 142 13. Reconnect all cables that were disconnected from the system board. What to do next: • To work with another piece of hardware, go to the appropriate section. • To complete the replacement, go to “Completing the parts replacement” on page 151. ThinkCentre M79 Hardware Maintenance Manual...

  • Page 143: Replacing The System Board

    Replacing the system board Attention: Do not open your computer or attempt any repair before reading and understanding the Chapter 1 “Read this first: Important safety information” on page 1. Note: Each computer has a unique Vital Product Data (VPD) code stored in the nonvolatile memory on the system board.
  • Page 144 15. To complete the replacement, go to “Completing the parts replacement” on page 151. The failing system board must be returned with a microprocessor socket cover to protect the pins during shipping and handling. To install the microprocessor socket cover, do the following: ThinkCentre M79 Hardware Maintenance Manual...

  • Page 145: Replacing The Front Audio And Usb Assembly

    1. After you have removed the microprocessor from the failing system board, close the microprocessor retainer and then put the lever to the locked position to secure the retainer in place. 2. Note the orientation of the socket cover, and install one side of the socket cover onto the microprocessor socket.

  • Page 146: Replacing The System Fan Assembly

    2. Remove the computer cover. See “Removing the computer cover” on page 105. 3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 106. ThinkCentre M79 Hardware Maintenance Manual...
  • Page 147 4. Pivot the drive bay assembly upward to gain access to the system fan assembly. See “Accessing the system board components and drives” on page 108. 5. Remove the hard disk drive for easier access to the system fan assembly. See “Replacing the hard disk drive”...

  • Page 148: Replacing The Thermal Sensor

    2. Remove the computer cover. See “Removing the computer cover” on page 105. 3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 106. 4. Locate the thermal sensor. See “Locating components” on page 31. ThinkCentre M79 Hardware Maintenance Manual...
  • Page 149 5. Pivot the drive bay assembly upward. See “Accessing the system board components and drives” on page 108. 6. Disconnect the thermal sensor cable from the thermal sensor connector on the system board. 7. On the inner side of the front panel, press the left retaining clip that secures the plastic holder of the thermal sensor as shown and then push the clip out of the outer side of the front panel.

  • Page 150: Installing Or Removing The Front Wi-Fi Antenna

    2. Remove the computer cover. See “Removing the computer cover” on page 105. 3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 106. ThinkCentre M79 Hardware Maintenance Manual...
  • Page 151 4. Peel off the paper that protects the stickers on the front antenna. Figure 59. Peeling off the paper that protects the stickers 5. Stick the front antenna to the front panel as shown. Then insert the front antenna cable through the hole in the front panel.

  • Page 152: Installing Or Removing The Rear Wi-Fi Antenna

    To install the rear Wi-Fi antenna, do the following: 1. Remove any media from the drives and turn off all attached devices and the computer. Then, disconnect all power cords from electrical outlets and disconnect all cables that are connected to the computer. ThinkCentre M79 Hardware Maintenance Manual...
  • Page 153 2. Install the rear Wi-Fi antenna to the rear Wi-Fi antenna cable connector attached on the rear of the computer. 3. Adjust the angle of the rear antenna to lower the risk of breaking the antenna by accident. Figure 62. Installing the rear Wi-Fi antenna What to do next: •...

  • Page 154: Replacing The Wi-Fi Units

    Note: The Bluetooth cable connects the Bluetooth connector on the Wi-Fi adapter card to the front USB connector on the system board to support the Bluetooth function. 4. Remove the screw that secures the Wi-Fi adapter card. ThinkCentre M79 Hardware Maintenance Manual...

  • Page 155: Removing The Wi-Fi Card Module

    5. Grasp the Wi-Fi adapter card that is currently installed and gently pull it out of the slot. Figure 65. Removing the Wi-Fi adapter card Note: The card fits tightly into the card slot. If necessary, alternate moving each side of the card a small amount until it is removed from the card slot.

  • Page 156: Installing The Wi-Fi Units

    3. Pull the Wi-Fi card module out of the mini PCI Express slot to remove it from the Wi-Fi adapter card. Figure 68. Removing the Wi-Fi card module Installing the Wi-Fi units To install the Wi-Fi units, do the following: ThinkCentre M79 Hardware Maintenance Manual...
  • Page 157 1. Insert the Wi-Fi card module into the mini PCI Express slot, and then install the two screws to secure the Wi-Fi card module to the Wi-Fi adapter card. Figure 69. Installing the Wi-Fi card module 2. Connect the front antenna cable and rear antenna cable to the Wi-Fi card module. Figure 70.

  • Page 158: Replacing The Keyboard Or Mouse

    Attention: Do not open your computer or attempt any repair before reading and understanding the Chapter 1 “Read this first: Important safety information” on page 1. To replace the keyboard or mouse, do the following: 1. Disconnect the old keyboard cable or mouse cable from the computer. ThinkCentre M79 Hardware Maintenance Manual...

  • Page 159: Completing The Parts Replacement

    2. Connect a new keyboard or mouse to one of the USB connectors on the computer. Depending on where you want to connect the new keyboard or mouse, see “Locating connectors, controls, and indicators on the front of your computer” on page 28 or “Locating connectors on the rear of your computer”...

  • Page 160: Obtaining Device Drivers

    8. To update your configuration, refer to “Using the Setup Utility program” on page 63. Note: In most areas of the world, Lenovo requires the return of the defective Customer Replaceable Unit (CRU). Information about this will come with the CRU or will come a few days after the CRU arrives.

  • Page 161: Chapter 12. Getting Information, Help, And Service

    You can use the information in this section to access useful resources relating to your computing needs. Lenovo ThinkVantage Tools The Lenovo ThinkVantage Tools program provides easy access to various tools to help you work more easily and securely. To access the Lenovo ThinkVantage Tools program, click Start ➙ All Programs ➙ Lenovo ThinkVantage Tools.

  • Page 162: Lenovo Support Web Site

    Most computers come with a diagnostic program that help you identify hardware problems. You can also get the latest technical information and download device drivers and updates from Lenovo Support Web site at: http://www.lenovo.com/support...

  • Page 163: Using Other Services

    • Replacement or use of parts not manufactured for or by Lenovo or non-warranted Lenovo parts • Identification of software problem sources • Configuration of BIOS as part of an installation or upgrade • Changes, modifications, or upgrades to device drivers •...
  • Page 164 Service availability and service name might vary by country or region. For more information about these services, go to the Lenovo Web site at: http://www.lenovo.com ThinkCentre M79 Hardware Maintenance Manual...

  • Page 165: Appendix A. Regulatory Information

    • Consult an authorized dealer or service representative for help. Lenovo is not responsible for any radio or television interference caused by using other than specified or recommended cables and connectors or by unauthorized changes or modifications to this equipment.
  • Page 166 Geräte der Klasse B. Dieses Gerät ist berechtigt, in Übereinstimmung mit dem Deutschen EMVG das EG-Konformitätszeichen - CE - zu führen. Verantwortlich für die Konformitätserklärung nach Paragraf 5 des EMVG ist die Lenovo (Deutschland) GmbH, Gropiusplatz 10, D-70563 Stuttgart. Informationen in Hinsicht EMVG Paragraf 4 Abs. (1) 4: Das Gerät erfüllt die Schutzanforderungen nach EN 55024 und EN 55022 Klasse B.

  • Page 167: Eurasian Compliance Mark

    All regulatory notices are available on the Lenovo Support Web site in electronic format. To access electronic copies of the documentation, go to http://www.lenovo.com/support and click User Guides & Manuals.
  • Page 168 ThinkCentre M79 Hardware Maintenance Manual...

  • Page 169: Appendix B. Weee And Recycling Information

    Collecting and recycling a disused Lenovo computer or monitor If you are a company employee and need to dispose of a Lenovo computer or monitor that is the property of the company, you must do so in accordance with the Law for Promotion of Effective Utilization of Resources.

  • Page 170: Recycling Information For Brazil

    If you need to replace it with a new one, contact your place of purchase or contact Lenovo for service. If you need to dispose of a disused lithium battery, insulate it with vinyl tape, contact your place of purchase or an industrial-waste-disposal operator, and follow their instructions.
  • Page 171 Customer participation is important to minimize any potential effects of batteries and accumulators on the environment and human health due to the potential presence of hazardous substances. For proper collection and treatment, go to: http://www.lenovo.com/recycling Appendix B. WEEE and recycling information...
  • Page 172 ThinkCentre M79 Hardware Maintenance Manual...

  • Page 173: Appendix C. Restriction Of Hazardous Substances Directive (Rohs)

    (RoHS) European Union RoHS Lenovo products sold in the European Union, on or after 3 January 2013 meet the requirements of Directive 2011/65/EU on the restriction of the use of certain hazardous substances in electrical and electronic equipment (“RoHS recast” or “RoHS 2”).

  • Page 174: Ukraine Rohs

    Ukraine RoHS India RoHS RoHS compliant as per E-Waste (Management & Handling) Rules, 2011. ThinkCentre M79 Hardware Maintenance Manual...

  • Page 175: Appendix D. China Energy Label

    Appendix D. China Energy Label © Copyright Lenovo 2014...
  • Page 176 ThinkCentre M79 Hardware Maintenance Manual...

  • Page 177: Appendix E. Energy Star Model Information

    For more information about ENERGY STAR, go to: http://www.energystar.gov Lenovo encourages you to make efficient use of energy an integral part of your day-to-day operations. To help in this endeavor, set the following power-management features to take effect when your computer has been inactive for a specified duration: Table 3.
  • Page 178 ThinkCentre M79 Hardware Maintenance Manual...

  • Page 179: Appendix F. Notices

    Lenovo representative for information on the products and services currently available in your area. Any reference to a Lenovo product, program, or service is not intended to state or imply that only that Lenovo product, program, or service may be used. Any functionally equivalent product, program, or service that does not infringe any Lenovo intellectual property right may be used instead.

  • Page 180: Trademarks

    Trademarks The following terms are trademarks of Lenovo in the United States, other countries, or both: Lenovo The Lenovo logo Rescue and Recovery ThinkCentre ThinkVantage Microsoft, Windows, and Windows Media are trademarks of the Microsoft group of companies. Linux is a registered trademark of Linus Torvalds.

  • Page 181: Index

    CRUs (Customer Replacable Units), returning defective and service customer support center getting Help and Support deleting a password Description device drivers Identifying FRUs devices, handling static-sensitive information diagnostic program getting © Copyright Lenovo 2014...
  • Page 182 Self-service CRUs serial connector service part numbers and help parts replacement, completing customer support center password getting Administrator services considerations other Hard disk purchasing additional Power-on password setting setting, changing, deleting password ThinkCentre M79 Hardware Maintenance Manual...
  • Page 183 BIOS updating the BIOS USB 2.0 connector USB 3.0 connector using a rescue medium, creating and BIOS passwords diagnostic program documentation other services Setup Utility VGA connector video features viewing and changing settings © Copyright Lenovo 2014...
  • Page 184 ThinkCentre M79 Hardware Maintenance Manual...

This manual is also suitable for:

Thinkcentre m79 10ctThinkcentre m79 10cuThinkcentre m79 10cvThinkcentre m79 10cw

Table of Contents