Lately my computer has been sounding sort of loud, but I wasn't sure if it was my CPU fan, PSU fan, rear exhaust fan, or my video card fan. A few days ago the sound got really loud, sort of sounding like a loud motor, and so I turned off the computer and opened it up. I unplugged the rear exhaust fan and video card, and it was still loud, so I knew it either had to be the CPU fan or PSU fan. I wasn't sure which, but I was guessing it was the PSU because I don't think the CPU fan is capable of being as loud as this was. So, I gave up, turned it back on, and after five minutes it turned itself off. Now my computer won't go back on. My best guess is that the sound I heard was the PSU, and now it died. What do you think?