v If the computer was functioning correctly after you installed an option
and is now malfunctioning, have the computer serviced.
v If the failure occurred immediately after you made a change to the
configuration, verify that you selected the correct settings.
v If the failure occurred immediately after you installed or removed a new
option and you get an error message from the Configuration/Setup
Utility program, disconnect the new device.
Power-on self-test (POST)
Each time you turn on your computer, it performs a series of tests that check
the basic operation of the base computer. This series of tests is called the
power-on self-test (POST).
POST does the following:
v Checks basic system board operations
v Checks the memory operation
v Compares the current system configuration with that established by the
Configuration/Setup Utility program
v Starts the video operation
v Verifies that the diskette drives are working
v Verifies that the hard disk drive and the CD-ROM drive are working
POST error messages appear when POST finds problems with or changes to
the hardware during startup. POST error messages are 3-, 4-, 5-, 8-, or
12-character alphanumeric messages and include brief explanations (except
I999XXXX errors).
Diagnostic error codes and messages
Diagnostic codes and messages appear if a hardware problem is detected by
one of the IBM Enhanced Diagnostics test programs or if POST detects a
problem. Along with error codes, the messages present text information that
can be used to identify a failing part.
POST error codes
Table 1. POST Error Codes
Code Description Action
101 Interrupt failure Have the computer serviced.
102 Timer failure Have the computer serviced.
106 System board failure Have the computer serviced.
110 Parity error Have the computer serviced.
Chapter 6. Troubleshooting 73
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