IBM ThinkCentre 8127 Hardware Maintenance Manual

Contents

Chapter 3. General CheckoutThis general checkout procedure is for Type 8127, 8183, 8184, 8320, 8416, 8417,8418, 8419, and 8429 computers.AttentionThe drives in the computer you are servicing might have been rearranged orthe drive startup sequence changed. Be extremely careful during writeoperations such as copying, saving or formatting. Data or programs can beoverwritten if you select an incorrect drive.Diagnostic error messages appear when a test program finds a problem with ahardware option. For the test programs to properly determine if a test Passed, Failedor Aborted, the test programs check the error-return code at test completion. See“Diagnostic error codes” on page 49.General error messages appear if a problem or conflict is found by an applicationprogram, the operating system, or both. For an explanation of these messages, referto the information supplied with that software package.Notes:v The default for this computer is to boot up quiet (no beep and no memory count andcheckpoint code display) when no errors are detected by POST.v To enable beep and memory count and checkpoint code display when a successful POSToccurs, do the following:1. Select Start Options in the IBM Setup Utility program (see “Starting the IBM SetupUtility program” on page 19).2. Set Power-On Self-Test to Enhanced.v Before replacing any FRUs, ensure that the latest level of BIOS is installed on the system.A down-level BIOS might cause false errors and unnecessary replacement of the systemboard. For more information on how to determine and obtain the latest level BIOS, see“BIOS levels” on page 147.v If multiple error codes are displayed, diagnose the first error code displayed.v If the computer hangs with a POST error, go to Chapter 7, “Symptom-to-FRU Index,” onpage 47.v If the computer hangs and no error is displayed, go to “Undetermined problems” onpage 89.v If an installed device is not recognized by the diagnostics program, that device might bedefective.0011. Power-off the computer and all external devices.2. Check all cables and power cords.3. Make sure the system board is seated properly.4. Set all display controls to the middle position.5. Power-on all external devices.6. Power-on the computer.7. Check for the following response:© Copyright IBM Corp. 2005 11