The sound is out on my Powerbook G4.

When I go into my preferences, only my bluetooth headphones show up on the output.  I tried using my headphones, but I'm not getting any sound through there either.  I reinstalled it 3 times, but no sound.  I then turned off my bluetooth, restarted the computer 2 or 3 times, but no sound, except for the tone that occurs when you start it up.  I would appreciate any help. 

Reset PRAM:
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

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