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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:
a. Non-IBM devices
b. External devices
c. Any adapters
d. Modem card
e. DIMMs (Remove all but one DIMM. Swap last DIMM with known
good DIMM)
f. Zip Drive
g. CD/DVD-ROM drive
h. Diskette drive
i. 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 2-9 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
service manual or a device not supported by IBM diagnostic tests.
If all devices and adapters have been removed, and the problem remains:
1. Remove all cables from connectors on the system board except the
power supply and switch cables. See “System Board Layout—Type
A-1” on page 5-2 and “System Board Layout—Type A-2” on page 5-5
for connector locations.
2. Remove all but one DIMM from sockets. Replace last DIMM with
known good DIMM.
3. Power-on the system unit and listen for any beeps.
Check Procedures 2-57