Undetermined Problems - Lenovo ThinkCentre M79 Hardware Maintenance Manual
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Also See for ThinkCentre M79:
- Hardware maintenance manual (186 pages) ,
- User manual (154 pages) ,
- Safety, warranty, and setup manual (2 pages)
Table of Contents
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Message/Symptom
Program loads from the hard disk with a known-good
diagnostics diskette in the first 3.5-inch diskette drive
RPL computer cannot access programs from its own hard
disk.
RPL computer does not RPL from server
Serial or parallel connector device failure (system board
connector)
Serial or parallel connector device failure (adapter
connector)
Some or all keys on the keyboard do not work
Undetermined problems
This section provides instructions on how to find out the failing devices or adapters.
1. Power-off the computer.
2. Remove or disconnect the following components (if installed) one at a time.
a. External devices (modem, printer, or mouse)
b. Any adapters
c. Memory modules
d. Extended video memory
e. External Cache
f. External Cache RAM
g. Hard disk drive
h. Diskette drive
3. Power-on the computer to re-test the system.
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 131.
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ThinkCentre M79 Hardware Maintenance Manual
FRU/Action
1. Run the Setup Utility program and check Startup
sequence.
2. Diskette Drive
3. Diskette Drive Cable
4. System Board
5. Power Supply
1. If network administrator is using LCCM Hybrid RPL,
check startup sequence:
a. First device - network
b. Second device - hard disk
2. Hard disk drive
1. Check startup sequence.
2. Check the network adapter LED status.
1. External Device Self-Test OK?
2. External Device
3. Cable
4. System Board
1. External Device Self-Test OK?
2. External Device
3. Cable
4. Alternate Adapter
5. System Board
1. Keyboard
2. Keyboard Cable
3. System Board
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Table of Contents
Troubleshooting
