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74 IBM Desktop System HMM
Undetermined Problems
If an error code, error message or error beeps is
present, go to “Index of Symptoms, Messages, Error
Codes, or Beeps” on page 38. If you did not receive
any messages, error codes, or beeps, see if the
symptom is listed in “Table 2-3 Error Symptoms List”
on page 45. If you still cannot solve the problem,
continue with this check:
1. Check the power supply voltages (See “Power
Supply Connectors and Voltages” on page 111). If
the voltages are correct, return here and continue
with the following steps:
2. Power off the system unit.
3. Perform the following checks, one by one, until you
have isolated the problem FRU (refer to “Parts/
Test Point Locations” on page 107 for locations):
- Load default settings in setup.
- Check all system board jumper positions and
switch settings.
- Check all adapter card jumper positions.
- Check all device jumper positions.
- Check all cables and connectors for proper in-
stallation.
4. If the jumpers, switch, and voltage settings are
correct, continue with the following steps:
•
Remove or disconnect the following, one at a time:
- Non-IBM devices
- External devices
- Any adapter card (modem card or video card, if
installed)
-CD-ROM drive
- Diskette drive
- Hard disk drive
-DIMM
-Processor
- System board
5. Power on the system unit.
6. Repeat steps 2 through 5 until you find the failing
device or adapter.
7. If software related, reload software from Recovery
CD.