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Undetermined problems
Check the power supply voltages (see "Power Supply Errors" on page 37). If the
voltages are correct, return here and continue with the following steps.
1. Power-off the computer.
2. Remove or disconnect the following components (if installed) one at a time.
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 "System board" on page 35).
Message/Symptom
Some or all keys on the keyboard do not
work
a. Non-IBM devices
b. External devices (modem, printer, or mouse)
c. Any adapters
d. Riser card
e. Memory modules
f. Extended video memory
g. External Cache
h. External Cache RAM
i. Hard disk drive
j. Diskette drive
FRU/Action
1. Keyboard
2. Keyboard Cable
3. System Board
Chapter 7. Symptom-to-FRU Index
77
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