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Undetermined problems
You are here because the diagnostic tests did not identify the failure, the Devices
List is incorrect, or the system is inoperative.
Note: A corrupt CMOS can cause undetermined problems.
Check the LEDs on all the power supplies, see“Power supply LED errors” on
page 110 If the LEDs indicate the power supplies are working correctly, return here
and do the following:
1. Power-off the computer.
2. Be sure the system is cabled correctly.
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 = 512 MB (4x128 MB DIMMs))
Note: Minimum operating requirements are:
a. 1 Power Supply
b. Power Backplane
c. System Board (with pins 2 and 3 on J23 connected together to bypass
the power switch; default is pins 1 and 2)
d. 1 Microprocessor
e. 1 Terminator Card in Slot 4
f. Memory Module (with a minimum of 1 bank of 128 MB DIMMs (128x4))
4. Power-on the computer. If the problem remains, suspect the following FRUs in
the order listed:
Power Supply
Power Backplane
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.
2. If you suspect a networking problem and all the system tests pass, suspect a
network cabling problem external to the system.
122 IBM xSeries 350 Type 8682: Hardware Maintenance Manual