Troubleshooting Symptom Charts/ Sound - 53
Sound
No sound from
computer’s internal
speaker
1 Disconnect any microphones or external speakers.
2 Verify the volume is set appropriately in the Sound system
preference or Sound control panel and mute is not checked.
3 Mac OS 9: Start up with all third-party extensions off.
Troubleshoot the extensions.
4 Clear parameter RAM. Hold down Command-Option-P-R
during startup until you hear a second startup chime.
5 Verify the speaker cable is plugged into the logic board.
6 Plug headphones or external speakers into the external jack.
If the external jack works, replace the internal speaker. If
the external jack doesn’t work, replace the logic board.
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