Sound has gone all whacky

Somehow my settings have changed, but I'm not sure where or how. When I go to play something on youtube, in itunes, or in quicktime, the sound is either very faint, distant and thin, or is just a bunch of shreiks and squeeking noises.
Any idea what the problem is?
Thanks

Sounds more like a computer problem than just QT. Suggest that you re-post over in the Using your Intel-based iMac Forums. Took a guess as that is the model iMac you based on your previous postings in the above mentioned forum.
In the meantime check your Sound Settings:
System Preferences>Sound>Input. Also check your output settings.
Another place to check:
1. Open Audio MIDI Setup (/Applications/Utilities/), then check the Audio Output setting.
2. Change the Audio Output setting to 44100.0 Hz.
3. Quit Audio MIDI Setup.

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