So I finally found out what was wrong with my PC.
Turns out the problem was that the port for my HDD went out, so I switched it into another port and it worked again. But alas, now there is a new problem: I installed the water cooler incorrectly.
sigh.
I hope that the cord that daisy-chains all the drives together (I'll get a picture of it tomorrow) is replacable, I might need that extra drive slot...