Apple G4 manual

Troubleshooting Symptom Charts/ Startup - 44

System quits or stops responding intermittently

At startup, power-on LED and computer stay on only as long as button is held in; when button is released, LED goes off and computer powers down.

1If the system quits or stops responding in a specific application, replace the application. Mac OS X: Verify the application is compatible with OS X.

2Clear parameter RAM. Hold down Command-Option-P-R during startup until you hear a second startup chime.

3Perform a clean install of system software with the system restore CD that came with the computer.

4Mac OS 9: Start up with extensions off to determine if there are system extension or control panel problems.

5Mac OS X: Relaunch Finder.

6Mac OS X: Run Disk Utility. Mac OS 9: Run Disk First Aid.

7Run Apple Hardware Test in loop mode (Control-L) for an extended time to test the memory. If the test finds bad memory, replace the DIMMs one at a time and test until all bad DIMMs are replaced with known-good modules.

8Reset the logic board.

•Power Mac G4 (AGP Graphics): Refer to “Resetting the PMU on the Logic Board” in this chapter.

•Power Macintosh G4 (PCI Graphics): Refer to “Resetting the PCI Logic Board” in this chapter.

9Replace the processor module.

10Replace the logic board.

Power Mac G4 (QuickSilver and QuickSilver 2002):

1Reseat the processor module.

2Replace the processor module.

3Replace the logic board.

4Replace the power supply.

Power Mac G4 (Digital Audio):

5Replace the power supply.

6Reseat the processor module.

7Replace the logic board.

8Replace the processor module.