All of a sudden I have no sound on my PowerMac G4, also iTunes gives me an error code 0x666D743F, what is going on?

2 Days ago everything was working fine, today I turn on my computer and the only sound I get is at startup. I've tried loading iTunes and I get an apple error code 0x666D743F. I've tried checking the MIDI Audio setup and tested the right and left speakers and i get sound there, but nothing else makes a sound, no alert sounds, nothing. I'm confused, please help?

Thank you for the reply. I have tried resetting the PRAM and nothing. I have deleted pref files that might have something to do with the issue and again nothing.
I have done this so far:
1. Reset PRAM
2. Rebooted in safe mode with preference files deleted or moved from the Library (com.apple.soundpref.plist and om.apple.systempreferences.plist)  
3. Done a virus, worm, trojan sweep - nothing
4. Made sure AUdio MIDI setting are as they should be ( although the speaker config option gives me sound from my speakers )
5. Defragged, repaired permissions, repaired disk etc...
6. Booted from OsX CD
Still no sound.
Should I wipe the drive and reinstall a fresh OS? Do you think this might help at all?
I am sure it isn't the soundcard hardaware or I wouldn't get a startup sound or sound at when I use the speaker configuration in AUDIO MIDI, right?
I'm frustrated! lol

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