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PowerBook G4 (12-inch) Troubleshooting -
7
Symptom Charts
Sound
Distorted sound from speakers
1. Verify sound is correct with external speakers/headphones. If sound is correct, replace
top case.
2. Check balance in Sound preference pane.
3. Replace rear panel assembly with attached speakers.
4. Replace subwoofer.
No sound from speaker(s)
1. Use the Software Update preference pane to verify that the latest software updates
have been installed.
2. Press the F3 key to verify that mute mode is not enabled.
3. Press the F4 or F5 key to check the volume setting.
4. Verify no external speakers or headphones are plugged in.
5. In the Sound preference pane confirm that only one device is listed in the Output tab.
6. Shut down computer and restart.
7. 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).
8. Verify that the speaker cable is connected properly to logic board.
9. Replace top case.
10. Replace logic board.