IBM Aptiva Series Hardware Maintenance page 56

How to Diagnose Combined FRUs : If an adapter or device consists
of more than one FRU, any of the FRUs might cause an error code.
Before replacing the device or adapter, remove the FRUs, one by one,
to see if the symptoms change.
If you have been directed here from another check procedure and
were instructed to replace the system board, and that does not correct
the problem, reinstall the original system board and go through
"START" again.
A POST error code and message can occur when system is powered-
on until the after of IBM logo shown on screen and one beep issued.
Please go to "Index of Symptoms, Messages, Error Codes, or Beeps"
on page 2-7 for additional help.
If you want to print a copy of a Setup Utility screen on an attached
printer, press Print Screen while the screen is displayed.
How to Use Error Messages : Use the messages, error codes, and
beep combinations that occur to diagnose failures. If more than one
failure occurs, diagnose the first failure first. The cause of the first
failure can result in false messages, error codes, or beeps. If you did
not receive any messages, error codes, or beeps, see if the symptom
is listed in "Index of Symptoms, Messages, Error Codes, or Beeps" on
page 2-7.
Attention: When you have deemed it necessary to replace a FRU,
and have then done so, you must then run a total system
check to ensure that no other activity has been affected
by the change. This System Check can be made through
PC-Doctor (Diagnostics \ All Test).
Human Error is a cause for concern when applied
to check procedures. It exists in every first time
set of analysis procedures. It is therefore essential
for effective and time-efficient servicing that each
stage of every procedure is verified. (For example:
When a symptom is found, or when a symptom
appears to have been cured; the preceding steps
should be repeated for accuracy of analysis).
PLEASE READ THE FOLLOWING
Check Procedures 2-3