If you have a laptop, your HDD could have popped out of place (by a millimeter). Our school laptops were like that in high school and meant to be replaced easily so when I dropped it (we had full insurance coverage) the HDD popped out a tiny bit and resulted in that message.
I would recheck all of your connections, even if you have a PC.
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Brian Griffin: Ah, if my memory serves me, this is the physics department.
Chris Griffin: That would explain all the gravity.
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