Chapter 6. Symptom-to-FRU Index 109
Undetermined problems
Check the power supply voltages (see “Power Supply Errors” on page 72). 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.
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
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 a System Board - Small Desktop Model” on page 60,
“Replacing a System Board - Desktop Model” on page 62, or “Replacing a system
board - Microtower Model” on page 66).
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