Really wierd sound in MBP.

I recieved my mbp a few days ago and love it. But today i had it on the desk and went to move it to the other room and i heard a wierd sound when it was at an angle that sounds like magnetic balls were rolling around. Its hard to describe the sound but it did sound like little balls were rolling around. It stopped doing it now. Please hel[ figure out what the sound was! Thanks
Macbook Pro   Mac OS X (10.4.7)  

Well, I would have said the hard drive, however, the fact that it only happens while on an angle leads me to believe it may be the fan. I can't imagine the hard drive being damaged to the point where it grinds on tilt and yet still works. More likely it is a loose fan that is aggravated by a tilt. It all depends on the location of the sound though.

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