If no error code is present, continue with this check. Check the power supply
voltages (see 'Power Supply Cable Connector Specifications'). If the voltages
are correct, return here and continue with the following steps:
Power off the system unit.
Perform the following checks, one by one, until you have isolated the
problem FRU.
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 jumper, switch, and voltage settings are correct, return here and continue:
Remove or disconnect the following, one at a time:
Non-IBM devices
External devices
Any adapters
Modem card, if installed
CD-ROM drive
Diskette drive
Hard disk drive
DIMM
Processor
System board
Power on the system unit
Repeat steps 1 trough 4 until you find the failing device or adapter.