Lets put it this way...I put an Antec SP-500 and a 939Dual-SATA2 in the same computer. The SP-500 made buzzing noises. Lots of other people had those noises, so I didn't think it was a problem. I didn't notice the various "bad power" issues (or didn't think they were issues)...System powers on when you flick the PSU switch, the occasional cold boot, the strange amount of time it took my hard drive to start, etc, so I just didn't care. My PSU rear fan stopped spinning, but I assumed that was because of the "smart" temp control. I noticed no problems. 7 months later my 939Dual-SATA2 died with a smokey smell in the air, leaving me with a cold boot and dead memory (my proccie survived
). 2 weeks later RMA's and purchases are cleared. I have new Gigabyte motherboard and memory. I can boot the machine, but not right after I've turned it off. Dismissing it as a strange glitch in the board, I continue playing until I can't turn my system on using the power switch...little did I know that meant a lack of a "power good" signal. I proceed to start my computer with a paper clip, a staple, and some jumpers. I find out later that the lack of a "power good" signal was bad, and promptly turn off my computer (technically call my parents from school). I now have a squealing half-dead Antec, which I can't RMA (had some misuse a while ago and it was under normal use the rest of the time...my system doesn't need too much power). I replaced the Antec with a ThermalTake 430W TR2, which runs they way a power supply is supposed to run.
In short- squealing PSU's are VERY BAD. Thanks for reading my outrageously long post lol.