Ok, I got a "PowerLink" 300W power supply, and randomly the other day it got loud all of a sudden. Normally its noise level is barely hearable, now it's just like woah. I got a suggestion to clean it, so I opened it up and cleaned off the few dusts around the fan, and once again it still happens. Anyone know why? By the way, I didn't install any new hard drives, it just randomly happened. 