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Chapter 1. Start here for hardware problems
This chapter contains a checkout procedure that you should follow to solve
hardware problems in the server.
About the checkout procedure
Before you perform the checkout procedure for diagnosing hardware problems,
review the following information:
v Read the safety information that begins on page vii.
v The diagnostic programs provide the primary methods of testing the major
v When you run the diagnostic programs, a single problem might cause more than
v Before you run the diagnostic programs, you must determine whether the failing
v If the server is halted and a POST error code is displayed, see "Error logs" on
v For information about power-supply problems, see "Solving power problems" on
v For intermittent problems, check the error log; see "Error logs" on page 28 and
© Copyright IBM Corp. 2006
components of the server, such as the system board, Ethernet controller,
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.
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 light path diagnostic LEDs that
indicate a microprocessor error, the error might be in the microprocessor or in the
microprocessor socket. See "Microprocessor problems" on page 42 for
information about diagnosing microprocessor problems.
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 are true:
– You have identified the failing server as part of a cluster (two or more servers
that share 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.
page 28. If the server is halted and no error message is displayed, see
"Troubleshooting tables" on page 37 and "Solving undetermined problems" on
page 89.
page 87 and "Power-supply LEDs" on page 53.
"Diagnostic programs, messages, and error codes" on page 55.
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