Solving undetermined problems
If the diagnostic tests did not diagnose the failure or if the system-board tray 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 29.
Damaged data in CMOS memory or damaged BIOS code can cause undetermined
problems. To reset the CMOS memory, use the clear CMOS jumper to override the
power-on password and clear the CMOS memory; see “System-board jumpers” on
page 8 and “Clearing CMOS memory” on page 47 for further information. If you
suspect that the BIOS code is damaged, see “Updating (flash-updating) the BIOS
code” on page 47 and “Recovering from a BIOS update failure” on page 48 for
further information.
Make sure that the power supply is working correctly. If the power supply is working
correctly and reseating the system-board tray in the chassis does not correct the
problem, complete the following steps:
1. Turn off the system-board tray.
2. Remove the system-board tray from the chassis.
3. If an expansion enclosure is installed, remove it (see “Removing an expansion
enclosure from a system-board tray” on page 73); otherwise, remove the
system-board tray cover (see “Removing the system-board tray cover” on page
121).
4. Remove or disconnect the following devices, one at a time, until you find the
failure. Reinstall, turn on, and reconfigure the system-board tray each time.
v
Any external devices.
v
Each adapter.
v
Each hard disk drive.
v
Memory modules. The minimum configuration requirement is one 1 GB DIMM
in slot 00.
The following minimum configuration is required for the system-board tray to
start:
v
One chassis
v
One microprocessor
v
One DIMM in slot 00
v
One system-board tray
v
One power supply
v
One fan assembly
5. Install and turn on the system-board tray. If the problem remains, suspect the
following components in the following order:
a. DIMM
b. System-board
tray
c. Microprocessor
If the problem is solved when you remove an adapter 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 system-board tray.
If you suspect a networking problem and the system-board tray passes all the
system tests, suspect a network cabling problem that is external to the system.
Chapter 2. Diagnostics
57
