2011 MBP 15 weird noise in 1 week

[jeanius]

I had my MBP 15 2.3 8gb for about a week now, I thought I got lucky because everyone seem to be having issues but I had none, but guess I spoke too soon, because for some odd reason now my fans r spinning very loud, before it was very quite and for some reason now its loud enough for me to notice the difference, it sounds like theres a CD spinning, also when I pick up the Mac and tilt it around a bit the sound stops when its at angles, but when I put it down on a flat surface the noise comes back....
so im wondering wtf this could be?
did something inside?? please help!!

 

[jeanius]

i think it might be the hard drive i have the 5800 rpm right now, i ordered the WD 7200rpm so lets see if that might fix the problem...

but the point is the noise was never there... is this normal or should i return?