Strange noise from right sight of macbook (please listen to video to judge)

strange sounds coming from right side of macbook pro. To me it seems like something is spinning or vibrates, although it sometimes seems that it has something to do electronics: by touching the macbook the sound changes pitch...just look to the vid to see and hear what I mean:
http://www.youtube.com/watch?v=y3MKlilX1pI
The difficult part of it: it only occurs 1 or 2 times per month...
so when I send it back to apple service, they can't do anything as long as the problem doesn't appear 'right there right then'. 1 in a 100 that thats going to happen...if someone knows about this problem, please comment so I can ask apple to take a better look at a specific part of my macbook.
ps: Apple service has seen the vids, but they say that thay can't take action as long it's not clear what is causing it.
Anybody any idea what is going on?
- at the time there wasn't a cd/dvd inside
- one vid is while using "greater performance" videocard the other isn't.
- macbooks ibought in april 2009

Rod Hagen wrote:
Sounds to me like the sort of noise you get when an audio turntable or the like has an earth problem of some kind.
I'd say electronic, not mechanical, and probably , as Retired Engineer hints, playing through the speaker.
When you touch the aluminium body of the computer it appears to reduce the sound. When you touch the glass trackpad it does not.
Does the sound ever occur if you have the computer attached to the power adaptor with the earthed three pin power cord attached?
If it is happening and you then plug headphones into the audio output socket, can you still hear it? If not then, then can you hear it through the headphones themselves?
Another possibility might be an environment with a very high level of static electricity, I guess, with your body providing an "earth" when you touch the metal body of the computer.
Cheers
Rod
Hi Rod thanx for the response, some answers:
I never use the earthed three pin power cord, could that be the problem? End if so does it come standard on MBPro's or is something wrong with mine?
If it accures I will put my headphones in and as others mentioned I will mute my audio, just to find out more about the problem.
High Level of static, this could be the case since inside my house I'm walking on 'crocs' http://www.crocs.com. But then it also accurred on while I was at work (and defenitely not wearing corcs )
still I have doubt that it is the speakers:
when you move the macboek, the noise drops and after a few seconds it comes back again
when you push the MBP surface the frequentie (pitch) changes rather then 'on' or 'off' as you would aspect with statics..

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