if you have a laptop?..Check the undernieth for loose screws...i am not saying there will be.But for no reason at all a screw came loose in mine near where the fan is located ..i wouldn't have known if i didn't hear it plop on the hardwood floor..So is all i can think is that the vibration from the fan worked it loose.The vibration is not noticeable but that's the only explanation i can think of..and i've had it from brand new.So it's never been tampered with.
