Strange noise from brand new Samsung Home Cinema...?

[XYZ]

I have bought a new Samsung C330 Home Theater and I have a strange problem that I can't solve. I have it hooked up to my laptop with a simple audio cable, and connected to my Samsung plasma TV through video in/out cable. So the problem is that I get this whisper in every speaker, center, front, rear... It's a continuous whoooooosing sound that drives me crazy!!!!!! When for example I go into the menu of the player, it suddenly stops, but when I go into the menu of the player and turn on the so called "Test Tone" it starts again and stops right after I stop the test tone. I don't hear it from then until I switch the input of the home theater to AUX again. One more thing, the f****ng whooooosing noise doesn't come only if I'm in AUX mode but also if I'm playing music or anything from DVD or USB. PLLLLEEEASSE HEEELP !!!!!!!!!!!