Scratchy noise from video?

I just opened up a fresh macbook (the shiny new aluminum one) and I'm sorely disappointed. I installed World of Warcraft and found that when it loads (and plays) a wretched, scratching sound is heard near the left hand side of the unit.
Odd.
So I messed with the video settings, messed with brightness, messed with being on power and off. All result with the same scratchy noise. Then I close warcraft and download a spore trial.
The exact same thing can be heard! Great, so I isolate the problem to the video - probably something to do with 3D.
Well... I was scrolling through the apple forums here and thought I heard the same noise. Lo and behold, when I scroll on the trackpad quickly up and down the same thing happens, though the scratch is faint. This is ridiculous.
Are there any solutions to this that don't require me trying to sign up with a genius bar appointment? I'm totally not happy and I hate having to talk my way into an appointment at those places.

This is a problem I started experiencing with my MacBook after about 1 year. The problem is most likely to occur when the machine is warm or hot (SMC fan control reports 60+ degrees celsius). The problem is related to the sound "card"/speakers, and it definitely is related to video playback. The interesting thing is that the noise does not occur with headphones plugged in and resumes when unplugged. I finally got fed up and took a screwdriver to my machine. The noise you describe is being emitted from the left speaker. I get the impression that the video codec must change the state of a sound "card" / chipset that causes the audio to misbehave. SMC fan control can be used to increase the fan speed on your machine as that does alleviate the problem, it also increases fan noise. :-/
I am disappointed to hear you are experiencing the same problem on a new machine. I was hoping to eliminate this nuisance with my next upgrade.

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