Hi, ive had a MSI gtx 680 since the end of September and i've just noticed today after looking at my pc through a window on the case, that one of its fan's isnt spinning, only one is, im wondering is this a way of keeping the sound low untill its needed? or is it not functioning properly, ive had a look and theirs nothing blocking it as its free to rotate but doesn't, any information on the subject will be greatly appreciated?