The microphone is not working

  1. If in Mac OS 9, check the Sound control panel and verify that the selection for input is the built-in microphone.
  2. Check the signal level and level meter and adjust the gain.
  3. If in Mac OS 9, remove Sound Preferences from the Preferences folder and restart.
  4. Reset PRAM (Press the power button, then hold down the Option-Command-P-R keys until you hear the startup chime at least one additional time after the initial startup chime).
  5. Verify microphone cable connection to logic board.
  6. Replace display assembly (which includes the microphone).
  7. Replace logic board.

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