So we had to replace a PSU on my mothers computer a couple of months ago when it died, and just today it started making loud noises, so I opened the case, confirmed it was the PSU, and when I touched it (after just being turned on) it was VERY Hot. I realize we ought to replace it/get her a new computer, but what could have caused this? the fan almost sounds like it is trying to operate without one of the blades. and it is by far the loudest I have ever heard, even louder than any PC in the house when it is running full tilt!