Well here's the deal. I just upgraded my computer a few weeks ago. I originally had an ASUS A8R32-MVP Deluxe, loaded with 2GB of OCZ DDR400 Platinum RAM and an AMD Opteron 180. I like to play a lot of Blu-rays on my computer, and have recently gotten into video encoding, so I figured it was time for an upgrade. I bought a new Core i7 920, an ASUS P6T6 WS Revolution, and 6GB of triple channel OCZ DDR3 1600 Platinum memory. After a few hours of using the computer, I noticed that there was a squealing sound coming from my computer. It didn't seem to be related to my CPU load, but it did occur during certain tasks. For example, when I extracted the Windows 7 RC ISO to my HDD, it squealed constantly until the extraction was complete. I confirmed this by extracting a second time for the hell of it and it did it again. It also squeals other times but I can't figure out a way to reproduce it besides extracting files. Now today for the first time my computer died on me for no apparent reason. I was just copying a 100kb XML file from one hard drive to another and it just died as if I pulled the plug. Then 2 seconds later without me touching anything, the computer turned back on and began booting up. It happened about 3 more times this morning, and became quite an annoyance. Then then entire afternoon it never died, but then tonight when I opened windows media center it died. This time it didn't restart on it's own, and I couldn't get it to turn back on. I unplugged it, played around with the switch on my PSU, nothing what so ever. So I opened up my case, and I touched my finger on the heatsink of my northbridge, and the thing just turned on. I opened windows media center and started to play my movie, and it died again about 8 minutes in. It just became a total pain tonight. Finally I got it working and was able to watch the entire movie with no problems after that. Then when the movie was over, I closed windows media center, and got up to go to the bathroom, and when I got back it was dead. Random weird things would get it to start up, like jiggling the 24 pin power connector would turn it on and off. I took it out and plugged it back in, still jiggling it would turn the computer on and off, even though it was nice and tight. So I used my jumper to clear the bios, started the computer up, and when I jiggled the 24 pin power connector, nothing happened, it stayed running. So that's where I am right now. I have no idea if this is a problem with my motherboard or PSU, so I'm trying to get some help here. My PSU is a Seasonic 500W Active PFC, and it does have an 8 pin power connector on it, so it's not like I'm only using the 4 pin connector. My other components are an ATI Radeon X800XL, an LG Blu-ray reader, a Western Digital 74GB 10k Raptor, 2 Western Digital Caviar Blacks, and an AverMedia Combo TV Tuner. I know my power supply isn't big, but I thought it would be adequate for my new setup. I never had any problems with the old one, and I figured my new motherboard, processor and memory would take up the same amount of power. Somebody please help me to correct this issue, it's really driving me crazy. Thanks.