Help - Sound on my PC

I get this crazy-driven buzz, and the tribble is just soooo high..

I'm not sure whats te problem, but I have Creative SPKs 2.1, and my sound card is an onboard one, but I had this problem on my old PC (SBLive!) ..

is that common ?
 
Play an MP3 or any long sound file and then start rotating the little jack around at the point where the speakers connect to the output on the PC.
 
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