Why does my computer keep making this noise?

So a couple of months ago my boyfriend scared me and I kind of threw my laptop off the bed. I think something may have gotten knocked lose because now once in awhile it makes a really loud whirling noise! I don't think it's the fan because it's not overheating and it's not due to a disc being in my computer either. My laptop doesn't lag or freeze when this happens, but I always shut it down and leave it off for awhile to be on the safe side. It usually happens if I pick my laptop up a certain way.