My brand new MBP 13" vibrates. It is a subtle kind of vibration, notable only as a ticklish sensation on your palms when resting them on the case, rather than a concrete, strong up and down shaking. I wouldn't even mind, if my wooden desk didn't pick up the vibration, acting as a soundbox with an audible, deep humming noise. You probably need good ears to hear it, I only do in a quiet room (like, my home desk...). After a short while, the deep humming is joined by a subtle higher-pitched humming. This is when there is absolutely no activity (no programs running, just an empty desktop). I am definitely not talking about the higher fan speeds accompanying increased processor activity and heat. Now I heard multiple reports of MBPs doing this, but never found an objective conclusion: Is that something MBPs simply do (it's still better than most laptops)? Should I, *sigh*, return the damn thing? In other words: Is there someone who could confirm that he or she has a 2009 MBP 13" (standard hardware load, cheapest of the unibodies) that has no vibrations whatsoever? Please note that it's subtle and I only noticed it after a while (but now can't stop thinking about it). Thanks.