Problems with soundoutput on internal speakers with Macbook 13"...!

Receiving my Macbook today 13" Alu...beautiful
One problem: Whatever sound comes out of the book on the internal speakers, its overlayed by a v. loud "pink noise"... I mean every sound...when u turn up the volume, the volume of the pink noise is not changing, but when its louder, u realize, that the music (for example) is recognizable in the background.
When I turn the book on...the starting sound comes 100% normal, after that the problem comes back..
Headphone out is completly 100% OK...no pink noise, all normal!
Anybody any idea? A friend told me, there was a similar problem in older laptop series, which was basically software based?
Thanx 4 your help!!!!

anybody?

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