Check Procedures 2-45
Undetermined Problem
If an error code is present, go to “Index of Symptoms, Messages, Error Codes,
or Beeps” on page 2-7. If no error code is present, continue with this check.
Check the power supply voltages (see “Power Supply” on page 2-32). 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 and switch settings.
• Check all adapter card jumper positions.
• 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:
• Non-IBM devices
• External devices
• Audio-I/O card
• Any adapters
• Modem card, if installed
• Riser card
• CD-ROM drive
• Diskette drive
• Hard disk drive
• SIMM
• CPU
• System board
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 2-7 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.
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