Thanks for the reassurance, but those sounds you speak of are making me wonder. I was only a few feet away from my computer when it happened, and I did not hear any loud or noticeable sound. All of a sudden the computer just powered down and wouldn't start back up. I didn't have to check any connections, of course, because only a few minutes before it started up just fine. So, the two things that led me to believe it was the PSU were 1) nothing would turn on at all, not even fans or LEDS, and 2) earlier that day my computer sounded like a car without a muffler, and I'm not sure if the CPU fan is even capable of being that loud, so I figured it must've been the PSU fan. But I really don't think I heard any type of loud sound when it died. Is it possible for them to die silently?