Browser Sound Stopped Working

I have a PowerBook with 10.4.7. For whatever reason, the sound has stopped working in Safari and Firefox. I get sound in Quicktime but not using Flash, Realplayer or any other html sound such as greeting cards. The guy at the genius bar suggested doing an Archive and Install. I did that and no change. I also have Virtual PC and when that starts it gives me an error stating it can't find the sound system. I can use iTunes and the sound works fine so it isn't the speakers. I know I loaded some plugin that broke the sound but I don't know what I did or when the sound stopped working. Any suggesting
Mac OS X (10.4.7)

rjarman1,
Welcome to Apple Discussions.
Check No sound from some applications, but system alert sounds play (Mac OS X 10.3, 10.4).
If you have Garage Band, you may also benefit from starting that application.
;~)

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