IBM Aptiva 2158 Hardware Maintenance Service

Also see for Aptiva 2158: Maintenance and service manual

Check Procedures 33Index of Symptoms, Messages, Error Codes, or BeepsHow to Use Error Messages: Use the messages, error codes, and beepscombinations that occur to diagnose failures. If more than one failure occurs,begin the diagnosis from the first failure that appeared. The cause of the firstfailure can result in false messages, error codes, or beeps. If you did notreceive any messages, error codes, or beeps, see if the symptom is listed in“Table 2-3 Error Symptoms List” on page 41.CAUTION: When you have deemed it necessary to replace a FRU, and havedone so, you must run a total system check to ensure that no otheractivity has been affected by the change. This system check can bedone through the diagnostics program (Select Diagnostics, then selectand 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 poweredon. Use this information throughout the diagnostic procedures. The POST is aseries of system checks and initializations that verify the correct operation ofthe base system.After a successful POST, the system attempts to load operating system. Thesystem can be customized for different startup (boot) methods by the BIOSSetup Utility. See “Startup Options” on page 17.The system's default startup sequence automatically looks for the operatingsystem 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 thatallow the system to operate well enough to run the diagnostics program.Table 2-1 lists BIOS error codes, messages, to their possible causes. table 2-2lists BIOS beeps to their possible causes. Table 2-3 lists error symptoms andtheir possible causes. The most likely cause is listed first. Make sure youcomplete all items in the cause or “Action/FRU” column. When servicing asystem, always begin with “Start” on page 29.If you are unable to correct the problem using these two index tables, go to“Undetermined Problems” On page 63.NOTE:1. If an error message and incorrect audio response occur, diagnose the errormessage first.2. If you cannot run the diagnostics program tests but did receive a POST errorcode and message, use “Table 2-1 POST Error Codes and Messages List”on page 34 to diagnose system problems.3. If you cannot run the diagnostics program tests but did receive a POST error