Troubleshooting Symptom Charts/ Error Tones - 46
Computer beeps twice
at startup
Two beeps means that incompatible RAM types may be installed.
Verify that only SDRAM DIMMs are installed. Use PC-100 DIMMs
on Power Mac G4 (PCI/AGP/Gigabit Ethernet) and PC-133
DIMMs on Power Mac G4 (Digital Audio/QuickSilvers).
1 Run Apple Hardware Test. 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.
2 Reseat the processor module.
3 Replace the processor module.
4 Replace the logic board.
Computer beeps three
times at startup
Three beeps means that no RAM banks passed memory testing.
1 Run Apple Hardware Test. 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.
2 Reseat the processor module.
3 Replace the processor module.
4 Replace the logic board.
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