Sudden, freaky speaker feedback and weird sound?

I have a 2.16 GHz Intel Core Duo 15" MacBook Pro with 2 GB memory, running 10.6.7.
I record a lot of voiceover on this machine via Sound Studio and Audacity (and sometimes Garage Band) and a USB microphone to use in Keynote videos and presentations.
Everything has been working perfectly until all of the sudden, when I open any music related program or plug in a USB microphone the computer makes a loud freaky feedback echo noise. Almost like you hear at a concert when they get too close to the speakers. You can only hear it if the computer volume is in the middle or higher and it does get louder or softer with the by increasing or decreasing the volume.
Now, I thought this was a problem with one of the music related programs (Sound Studio, Audacity, Garage Band) since it only seemed to happen when they are open....
But, yesterday I was closing the laptop with NO programs open at all and RIGHT BEFORE the lid closed and the computer when to sleep, the speakers made the sound. Again with NOTHING open or running.
So I'm at a loss. The sound is now occurring randomly. Do I have bad speakers or something else going on?
Any thoughts or help is GREATLY appreciated.

Yeah I had tried that before, no dice on that though. Thank you anyway.
I actually have seemed to have fixed the problem! I muted Stereo Mix in recording control.
Message Edited by Dan7056 on 11-01-2009 05:38 AM

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