Apple Self Repair Guides

No sound from speakers

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1. Use the Software Update system preference pane to verify that the latest audio update has been installed.
2. Press the F3 key (with the fn key pressed and not pressed) to verify that mute mode is not enabled.

1. Press the F4 or F5 key (with the fn key pressed and not pressed) to check the volume setting.
2. Verify no external speakers or headphones are plugged in.
3. Check the speakers tab on the Sound control panel to confirm that the software is correctly seeing that there are no external speakers or headphones connected.
4. Shutdown computer and restart.
5. 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).

Warning: Resetting the PRAM will permanently remove a RAM disk, if present, and all of its contents. You will also need to reset the date and time (using the Date & Time system preference pane).

1. Verify that the speaker cable is connected properly to sound board.
2. Check speaker cable. Verify left and right cable connections.
3. Check with headphones or external speaker, if audio is heard, replace speaker assembly.
4. Replace sound board flex cable.
5. Replace sound board.
6. Replace the logic board.