Check the power supply voltages (see “Power Supply” on page 2-26). If the
voltages are correct, return here and continue with the following steps:
1. Power off the system unit.
2. Perform the following checks, one by one, until you have isolated the
problem FRU (refer to “Parts/Test Point Locations” on page 5-1 for
locations):
Check all system board jumper positions.
Check all adapter card jumper positions.
Check all adapter card switch settings.
Check all device jumper positions.
Check all cables and connectors for proper installation.
If the jumpers, switch settings, and voltages are correct, return here and
continue.
3. Remove or disconnect the following, one at a time:
Adapters/Cards
a. Non-IBM devices
b. External devices
c. Sound adapter card
d. Any adapter
e. Modem card
f. Riser card
Memory
a. SIMMs
b. Cache memory
c. Video memory modules
DASD
a. CD-ROM drive
b. Diskette drive
c. Hard disk drive
4. Power on the system unit.
5. Repeat steps 1 through 4 until you find the failing device or adapter.
If the symptom changes, go to “Index of Symptoms, Messages, Error Codes,
or Beeps” on page 2-10 or to the check procedure for the last item tested.
Replace the last item tested if the system operates normally after removing
the last item.
Note: If you are unable to find a check procedure that corresponds to the
device or error code, you either have an IBM device with its own
Check Procedures 2-63
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