MBP late 2011 - Weird digital noise coming from the top left speaker zone

Hello, it doesn't matter if the volume of the speakers is muted, doesn't matter if the volume is at maximum position or at the middle position, the noise will come whenever it wants, at the same very loud level. When the noise begins, the coloured disk appears, and the OS is freezing. Updating to the latest version of Lion didn't help. The hardware test, short or extended did not find anything wrong. Also resetting pram/nvram didn't help. Sometimes, and especially at startup, before the boot sound, the speakers can be heard popping/clicking. Even if it comes from the left speaker zone, i guess it's not from there, because this weird sound can be heard even through the hole of the network adapter, but any other sound when playing music comes only from the speaker, the LAN adapter hole is quiet (funny, isn't it?). This noise can be also described like the sound of an old printer... or almost like a Spectrum loading from tape...
But there is no problem at all in Bootcamp using Windows 7. I still need to use OS X, can anyone help?
Bellow You can hear the noise for Yourselves:
http://www.zshare.net/video/990900695940b5e9/

The noise sounds like this ?
http://www32.zippyshare.com/v/94854400/file.html
http://www22.zippyshare.com/v/13891679/file.html
Does anyone knows what it's wrong ???
Someone please call 911
STEVE !!!! Where are U STEVE ????

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MBP late 2011 - Weird digital noise coming from the top left speaker zone

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