Sound intermittently stops working on my PowerBook G4

I am not sure where to post this problem. I have a PowerBook G4 running OS 10.5.5. The sound sometimes stops working so that I can not hear the audio portion of movies. I have to do a restart to get it working. Today it took three restarts to get it back. I have repaired permissions, removed the sound preference but I still have the problem. Any ideas would be GREATLY appreciated. Thank you

This was a common issue till one of the Leopard Updates. Archive & Installs are real nice in Leopard. You might consider that. It takes a 60-90 minutes with updates, but is clean, and harmless. Backup, first, of course.

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