Problem Determination Tips - IBM 884015U Maintenance And Troubleshooting Manual

Note: Damaged data in CMOS or damaged BIOS code can cause undetermined
problems. If you suspect that the BIOS code is damaged, see "Recovering the
BIOS code" on page 68.
Note: Damaged data in BIOS code can cause undetermined problems.
Check the LEDs on all the power supplies. 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
4. Turn on the server. If the problem remains, suspect the following FRUs in the
Notes:
1. If the problem goes away when you remove an adapter from the system and
2. If you suspect a networking problem and all the system tests pass, suspect a

Problem determination tips

Because of the variety of hardware and software combinations that can be
encountered, use the following information to assist you in problem determination. If
possible, have this information available when requesting assistance from Service
Support and Engineering functions.
v Machine type and model
v Microprocessor or hard disk upgrades
v Failure symptom
failure (turn on the server and reconfigure each time):
Any external devices
Surge suppressor device (on the server)
Modem, printer, mouse, or non-IBM devices
Each adapter
Drives
Memory modules (minimum requirement = 512 MB (2 banks of 256 MB
DIMMs))
Note: Minimum operating requirements are:
a. One power supply
b. PCI riser card
c. PCI-X riser card
d. Power cage assembly
e. System board
f. One microprocessor and VRM
g. Memory module (with a minimum of two 256 MB DIMMs)
order listed:
Power supply
Power cage assembly
System board
replacing that adapter does not correct the problem, suspect the system board.
network cabling problem external to the system.
– Do diagnostics fail?
– What message appears in the diagnostics log?
– What, when, where, single, or multiple systems?
– Is the failure repeatable?
– Has this configuration ever worked?
– If it has been working, what changes were made prior to it failing?
Chapter 6. Symptom-to-FRU index
105