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Chapter 6. Troubleshooting 45
4. Did the IBM Setup Utility program start automatically after the error
message was displayed?
No - Follow the action for this error message described in “POST error codes”
on page 45.
Yes - continue to step 5.
5. Have you recently added, removed, or changed any hardware?
No - Have the computer serviced.
Yes - Do one of the following:
• If the failure occurred immediately after you installed or removed an
option, and you have not yet updated the configuration, see Chapter 4,
“Using the IBM Setup Utility program,” on page 27.
• If the computer was functioning correctly after you installed an option
and is now malfunctioning, have the computer serviced.
• If the failure occurred immediately after you made a change to the
configuration, verify that you selected the correct settings.
Power-on self-test (POST)
Each time you turn on your computer, it automatically 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:
• Checks basic system board operations
• Checks the memory operation
• Compares the current system configuration with that established by the IBM
Setup Utility program
• Starts the video operation
• Verifies that the diskette drives are working
• Verifies that the hard disk drive and the optical drive are working
POST error codes are displayed when POST detects problems with or changes to
the hardware configuration during startup. POST error messages are 3-, 4-, 5-, 8-,
or 12-character alphanumeric messages and include brief explanations.
POST error codes
The computer might display more than one error message. Often, the first error to
occur causes subsequent errors. When using the POST message charts in this