Solving Undetermined Problems - IBM 8872 - eServer xSeries 460 Service Manual

Solving undetermined problems

If the diagnostic tests did not diagnose the failure or if the server is inoperative, use
the information in this section.
If you suspect that a software problem is causing failures (continuous or
intermittent), see "Software problems" on page 48.
Damaged data in CMOS memory or damaged BIOS code can cause undetermined
problems. To reset the CMOS data, use the password override jumper to override
the power-on password and clear the CMOS memory; see "I/O board internal
connectors and jumpers" on page 8. If you suspect that the BIOS code is damaged,
see "Recovering from a BIOS update failure" on page 77.
Check the LEDs on all the power supplies (see "Power-supply LEDs" on page 57).
If the LEDs indicate that the power supplies are working correctly, complete the
following steps:
1. Turn off the server.
2. Make sure that the server is cabled correctly.
3. Remove or disconnect the following devices, one at a time, until you find the
The following minimum configuration is required for the server to turn on:
v One microprocessor
v Two 1 GB DIMMs on the memory card
v One power supply
v Power backplane
v Power cord
v I/O board
v PCI-X board
4. Turn on the server. If the problem remains, suspect the following components in
If the problem is solved when you remove an adapter from the server but the
problem recurs when you reinstall the same adapter, suspect the adapter; if the
problem recurs when you replace the adapter with a different one, suspect the
PCI-X board.
If you suspect a networking problem and the server passes all the system tests,
suspect a network cabling problem that is external to the server.
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IBM xSeries 460 Type 8872 and xSeries MXE 460 Type 8874: Problem Determination and Service Guide
failure. Turn on the server and reconfigure it each time.
v Any external devices.
v Surge-suppressor device (on the server).
v Modem, printer, mouse, and non-IBM devices.
v Each adapter.
v Hard disk drives.
v Memory modules. The minimum configuration requirement is 2 GB (two 1 GB
DIMMs).
v Service processor.
the following order:
a. Power backplane
b. I/O board
c. Memory card
d. Microprocessor tray