IBM Aptiva 2124, Hardware Maintenance Service

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Check Procedures 2-3
Start
This is the entry point for all check procedures. The check procedures use
failure symptoms, Power-On Self Test (POST) error codes, or beeps to help
determine the defective field replaceable unit (FRU). Follow the suggested
check procedures or use the diagnostics diskette to determine the problem
FRU.
IMPORTANT: Replace FRUs ONLY when it is determined that the error is
not a result of software, loose contacts, or dirty component surfaces.
Any FRU change should be verified by running a complete test
(“Diagnostics - All Tests” in PC-Doctor diagnostics program).
This book comes with a diagnostic program diskette. This diskette should be
used ONLY with 2153/2139 Service Level A (SL-A) IBM Aptiva Personal
Computers. Do not use this diskette on other models.
POST error codes and error messages are displayed on the screen after the
IBM logo. A beep will precede each error code or message. Please refer to
“Index of Symptoms, Messages, Error Codes, or Beeps” on page 2-8 for
additional help.
All voltages in the check procedures are positive unless otherwise indicated.
Use frame ground for all voltage checks unless otherwise specified.
IMPORTANT: There is a Power Override switch located at the back of the
machine, just above the connector for the power cable. If the system
does not power on after pressing the power button, situated on the
front of the machine, please check the power cable and the Power
Override switch. If the Power Override switch is switched on, no
power is supplied to the system.
NOTE: If the check procedures instruct you to replace a FRU and the error
message persists, an option adapter card might be causing the
failure. Remove all option adapter cards, one at a time, until the
error changes or the problem is no longer apparent. Replace the last
option adapter card removed.
The hard disk drive contains pre-loaded software. Refer to "Software
Recovery Procedure" on page 4-51 to reinstall the original software. Be sure
to reload the software on the primary hard disk drive (Drive C) when replacing
it.