Diagnostics
This section provides basic troubleshooting information to
help you resolve some common problems that might occur
with your server.
Diagnostic tools overview
The following tools are available to help you identify and
resolve hardware-related problems:
v
POST beep codes, error messages, and error logs
The power-on self-test (POST) generates beep codes
and messages to indicate successful test completion or
the detection of a problem. See “POST error codes” on
page 171 for more information.
v
Light path diagnostics
Your server has light-emitting diodes (LEDs) to help you
identify problems with server components. These LEDs
are part of the light-path diagnostics that are built into
your server. By following the path of lights, you can
quickly identify the type of system error that occurred.
See “Light path diagnostics” on page 18 and the table in
“Information panel system error LED” on page 162 for
more information.
v
Diagnostic programs and error messages
The server diagnostic programs are stored in
upgradable read-only memory (ROM) on the system
board. These programs are the primary method of
testing the major components of your server. See
“Diagnostic programs and error messages” on page 20
for more information.
POST
When you turn on the server, it performs a series of tests
to check the operation of server components and some of
the options installed in the server. This series of tests is
called the power-on self-test or POST.
If POST finishes without detecting any problems, a single
beep sounds, the first screen of your operating system or
application program appears, and the System POST
Complete (OK) light is illuminated on the operator
information panel.
If POST detects a problem, more than one beep sounds
and an error message appears on your screen. See “Beep
Symptoms” on page 159 and “POST error codes” on
page 171 for more information.
© Copyright IBM Corp. 2000
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