Apple Self Repair Guides

System crashes or hangs intermittently

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

1. Clear parameter RAM. Hold down Command-Option-P-R during startup until you hear a second startup chime.
2. Perform a clean install of system software with the software install and restore disc that came with the computer.
3. Mac OS 9: Start up with extensions off to determine if there are system extension or control panel problems.
4. Mac OS X: Relaunch Finder.
5. Mac OS X: Run Disk Utility. Mac OS 9: Run Disk First Aid.
6. Run 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.
7. Replace the logic board.