Sound whistles

Microsoft Windows 7 home premium
April 29, 2010 at 20:31:12
Specs: Windows 7
Had this laptop for a month now. And just playing a movie through itunes. As soon as I turn sound up I get a high pitched whistling sound. Anythoughts on fixing this?

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April 29, 2010 at 21:19:35
does your laptop has a microphone? if so check if its muted.

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April 30, 2010 at 07:00:48
The sound is probably that of feedback between your built in speakers or headset and a microphone.

See Response 6 in this

starting at

" Make sure you don't have volumes set too low or muted, for things you want to hear or use.... "

And near the end of that part...

"NOTE that Microphone is Muted there by default. "

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