keyboard, mouse (pointing device), serial ports, and hard disk drives. You can
also use them to test some external devices. If you are not sure whether a
problem is caused by the hardware or by the software, you can use the
diagnostic programs to confirm that the hardware is working correctly.
v When you run the diagnostic programs, a single problem might cause more than
one error message. When this happens, correct the cause of the first error
message. The other error messages usually will not occur the next time you run
the diagnostic programs.
Exception: If there are multiple error codes or LEDs that indicate a
microprocessor error, the error might be in the microprocessor or in the
microprocessor socket. See “Microprocessor problems” on page 85 for
information about diagnosing microprocessor problems.
v Before running the diagnostic programs, you must determine whether the failing
server is part of a shared hard disk drive cluster (two or more servers that share
external storage devices). If it is part of a cluster, you can run all diagnostic
programs except the ones that test the storage unit (that is, a hard disk drive in
the storage unit) or the storage adapter that is attached to the storage unit. The
failing server might be part of a cluster if any of the following conditions is true:
– You have identified the failing server as part of a cluster (two or more servers
sharing external storage devices).
– One or more external storage units are attached to the failing server and at
least one of the attached storage units is also attached to another server or
unidentifiable device.
– One or more servers are located near the failing server.
Important: If the server is part of a shared hard disk drive cluster, run one test
at a time. Do not run any suite of tests, such as “quick” or “normal” tests,
because this might enable the hard disk drive diagnostic tests.
v If the server is halted and a POST error code is displayed, see “Error logs” on
page 70. If the server is halted and no error message is displayed, see
“Troubleshooting tables” on page 81 and “Solving undetermined problems” on
page 114.
v For information about power-supply problems, see “Solving power problems” on
page 112.
v For intermittent problems, check the error log; see “Error logs” on page 70 and
“Diagnostic programs, messages, and error codes” on page 94.
Performing the checkout procedure
To perform the checkout procedure, complete the following steps:
1. Is the server part of a cluster?
v No: Go to step 2.
v Yes: Shut down all failing servers that are related to the cluster. Go to step 2.
2. Complete the following steps:
a. Turn off the server and all external devices.
b. Check the internal and external devices for compatibility at
http://www.ibm.com/servers/eserver/serverproven/compat/us/.
c. Check all cables and power cords.
d. Set all display controls to the middle positions.
e. Turn on all external devices.
Chapter 5. Diagnostics 79
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