Solving Undetermined Problems - IBM BladeCenter JS21 Types 8844 Service Manual

Solving undetermined problems

Note: When you are diagnosing a problem in the JS21 Type 7988 or 8844 blade
server, you must determine whether the problem is in the blade server or in the
BladeCenter unit.
v If all of the blade servers have the same symptom, it is probably a BladeCenter
v If the BladeCenter unit contains more than one blade server and only one of the
Check the LEDs on all the power supplies of the BladeCenter unit where the blade
server is installed. If the LEDs indicate that the power supplies are working
correctly, and reseating the blade server does not correct the problem, complete the
following steps:
1. Make sure that the control panel connector is correctly seated on the system
2. If no LEDs on the control panel are working, replace the bezel assembly; then,
3. Turn off the blade server.
4. Remove the blade server from the BladeCenter unit and remove the cover.
5. Remove or disconnect the following devices, one at a time, until you find the
6. Install and turn on the blade server. If the problem remains, suspect the
If the problem is solved when you remove an I/O expansion option from the blade
server but the problem recurs when you reinstall the same expansion option,
suspect the expansion option; if the problem recurs when you replace the
expansion option with a different one, suspect the System-board and chassis
assembly.
If you suspect a networking problem and the blade server passes all the system
tests, suspect a network cabling problem that is external to the system.
unit problem; for more information, see the Hardware Maintenance Manual and
Troubleshooting Guide or Problem Determination and Service Guide for your
BladeCenter unit.
blade servers has the problem, troubleshoot the blade server that has the
problem.
board (see "System-board connectors" on page 7 for the location of the
connector).
try to power-on the blade server from the BladeCenter Web interface (see the
BladeCenter Management Module User's Guide for more information).
failure. Reinstall, turn on, and reconfigure the blade server each time.
v I/O expansion option.
v Hard disk drives.
v Memory modules. The minimum configuration requirement is 1 GB (two 512
MB DIMMs).
The following minimum configuration is required for the blade server to start:
v System-board and chassis assembly (with two microprocessors)
v Two 512 MB DIMMs
v A functioning BladeCenter unit
following components in the following order:
a. DIMM
b. System-board and chassis assembly
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Chapter 2. Diagnostics