IBM xSeries 236 8841, Руководство пользователя

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Undetermined problems
Use the information in this section if the diagnostic tests did not identify the failure,
the devices list is incorrect, or the system is inoperative.
Damaged data in CMOS memory or damaged BIOS code can cause undetermined
problems. To reset the CMOS data, use the password override switch to override
the power-on password and clear the CMOS memory; see “Erasing a lost or
forgotten password (clearing CMOS memory)” on page 99. If you suspect that the
BIOS code is damaged, see “Recovering the BIOS code” on page 97.
Check the LEDs on all the power supplies (see “Power-supply LEDs” on page 95).
If the LEDs indicate the power supplies are working correctly, complete the
following steps:
1. Turn off the server.
2. Be sure the server is cabled correctly.
3. Remove or disconnect the following devices (one at a time) until you find the
failure (turn on the server and reconfigure each time):
v
Any external devices
v Surge suppressor device (on the server)
v Modem, printer, mouse, or non-IBM devices
v Each adapter
v Drives
v Memory modules (minimum requirement = two 256 MB DIMMs)
Note: Minimum operating requirements are:
a. One power supply
b. System board with functioning integrated VRD
c. One microprocessor
d. Memory module (with a minimum of two 256 MB DIMMs)
4. Turn on the server. If the problem remains, suspect the following FRUs in the
order listed:
v
Power supply
v
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.
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xSeries 236 Type 8841: Hardware Maintenance Manual and Troubleshooting Guide