User Guide

TITLE
PowerBook G4: No Sound And Sound Control Panel Indicates An
External Device Is Plugged In
Writer:
Created:
Modified:
Huckabone, Michael
2001-7-20
2001-8-17
TOPIC
No sound heard and the Speakers section of the Sound control panel indicates that an exteranal
device is plugged in (to the headphone jack or USB ports).
DISCUSSION
*RESTRICTED: Apple Specialists/Apple-Authorized Self-Servicing Providers *
Internal Use Only
Troubleshooting Procedure
The steps to solve a symptom are listed sequentially. You might not need to perform every step
before the symptom is solved. Start with the first step, and then test for the symptom. If the
symptom persists, replace any modules you removed, go to the next step, and test again.
Continue down the list until the symptom is solved.
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.
1.
If not, and if nothing is plugged in, try plugging in headphones or external speakers.
Restart the computer. Remove the device.
2.
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 control panel).
3.