IBM xSeries 220 Hardware Maintenance Manual page 131

3. Remove or disconnect the following (one at a time) until you find the failure
(power-on the computer and reconfigure each time).
• Any external devices
• Surge suppressor device (on the computer)
• Modem, printer, mouse, or non-IBM devices
• Each adapter
• Drives
• Memory Modules (Minimum requirement = one 128 MB DIMM)
Note: Minimum operating requirements are:
a. 1 Power Supply
b. System Board
c. 1 Microprocessor
d. 1 Terminator Card in Slot 2
e. 1 Memory Module (minimum of 1 DIMM in slot labeled DIMM 1)
4. Power-on the computer. If the problem remains, suspect the following FRUs in
the order listed:
Power Supply
System Board
Notes:
1. If the problem goes away when you remove an adapter from the system, and
replacing that adapter does not correct the problem, suspect the system board,
then the power supply.
2. If you suspect a networking problem and all the system tests pass, suspect a
network cabling problem external to the system.
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Symptom-to-FRU index