Apple g4 Manual Do Utilizador
PowerBook G4 (1GHz/867MHz) Troubleshooting - 14
Sound Symptom Charts
Sound
No sound heard and the Speakers section of the Sound control panel indicates
that an external device is plugged in (to the headphone jack or USB ports)
that an external device is plugged in (to the headphone jack or USB ports)
1. If there is nothing plugged into the headphone jack or USB ports, the picture in the
Speakers section of the Sound control panel should be of the internal speakers, as
shown here.
shown here.
2. If not, and if nothing is plugged in, try plugging in headphones or external speakers.
Restart the computer. Remove the device.
3. 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).
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 control panel).
and all of its contents. You will also need to reset the date and time (using the
Date & Time control panel).
4. Replace logic board.
No sound from speaker(s)
1. Use the Software Update control panel 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.
3. Press the F4 or F5 key (with the fn key pressed and not pressed) to check the volume
setting.
4. Verify no external speakers or headphones are plugged in.
5. 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.
6. Shutdown computer and restart.