Realplayer and WMP - video but no audio

I have installed the latest version of realplayer and Windows Media PLayer - they both play video with no problem but not sound. I get no error notices and everything seems to be working exactly as it should, its just that nothing comes out of the speakers - there is also no sound when playing online radio streams. I have tried everything I can think of - turning up the sound, restarting, reinstalling, verifying disk permissions and checking MIDI audio output (this option doesn't seem to be available). iTunes audio output works, as do system sounds but I can't seem to get any audio output from WMP or Realplayer. Incidentally, VLC player works fine.
Could any of this be related to iTunes 7 which has been crashing constantly? Any ideas would be greatly appreciated.
Macbook Pro 2.0Ghz Mac OS X (10.4.7)

Erve...Try starting GarageBand...let it
'Initialize'...then close out of the program...check
your media players again
dave
Dave - you are a genius, thank you. Realplayer and WMP are both working fine after starting Garageband. Thanks very much indeed - much appreciated.
I don't suppose you have any ideas about my other problem??? (http://discussions.apple.com/thread.jspa?threadID=657640&tstart=0)

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Hy,
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Realplayer and WMP - video but no audio

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