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Troubleshooting Symptom Charts/ Error Tones - 45
Error Tones
Note: Error tones occur before system software loads.
Computer beeps once
at startup
One beep means that no RAM is installed or detected.
1 If no DIMM is present, install a known-good DIMM in the top
slot and try again.
2 Reseat the DIMMs.
3 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.
4 Reseat the processor module.
5 Replace the processor module.
6 Replace the logic board.