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38 IBM Desktop System HMM
Index of Symptoms, Messages, Error
Codes, or Beeps
How to Use Error Messages:
Use the messages,
error codes, and beeps combinations that occur to
diagnose failures. If more than one failure occurs,
begin the diagnosis from the first failure that
appeared. 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 “Table 2-3 Error Symptoms
List” on page 45.
CAUTION:
When you have deemed it necessary to
replace a FRU, and have done so, you must
run a total system check to ensure that no
other activity has been affected by the change.
This system check can be done through the
diagnostics program (Select Diagnostics, then
select and execute All Tests from PC-Doctor).
POST:
Some diagnostic aids are resident in the
machine, such as the Power-On Self Test (POST).
The machine performs the POST each time it is
powered on. Use this information throughout the
diagnostic procedures. The POST is a series of
system checks and initializations that verify the
correct operation of the base system.
After a successful POST, the system attempts to load
operating system. The system can be customized for
different startup (boot) methods by the Configuration/
Setup Utility. “Startup Options” on page 20.
The system's default startup sequence automatically
looks for the operating system files in the hard disk if
these files are not found in the diskette.
WARNING:
Remember that POST does not test all
areas, but only those that allow the system to
operate well enough to run the diagnostics
program.
Table 2-1 lists BIOS error codes, messages, and their
possible causes. Table 2-2 lists BIOS beeps and their
possible causes. Table 2-3 lists error symptoms and
their possible causes. The most likely cause is listed
first. Make sure you complete all items in the cause or
“Action/FRU” column. When servicing a system,
always begin with “Start” on page 33.