I just built a new computer (all the parts were recommended from TomsHardware.com (it's their low-end system). http://www.tomshardware.com/2007/09/17/sbm_low_cost_system/
That website lists all the parts I ordered if that helps at all. When I put everything together, I pressed the power button and it turned out. 3 seconds later, the machine turned itself off. Not touching anything, 3 seconds later, it turned back on. Rinse. Repeat. I've tried unplugging EVERYTHING down to just the core motherboard 24pin and the 4pin 12x with the processor installed. Still nothing. I've switched out a different powersupply (both of them were brand new). Nothing. Two things I will mention that may have been my fault is that I did put the dual channel memory right next to each other (one yellow, one black ... I know, I know). But I tried switching it, and it still didn't work (also, will that screw up my memory?). I also may have bent a pin or two when trying to put the processor in (didn't realize there was a cover on the processor when I put it in).
Now, I've done a bit of research on this, and lots of people just recentely started having this problem. However, I have yet to see one solution on it. I sent my motherboard and processor back for an exchange with new ones. The processor is here unopened, and I'm just waiting on the motherboard. I'm trying to make sure this doesn't happen again.
My guess is that the processor was overheating very rapidly, which could be caused by improper fan placement (it's thermal tape, and I did put the fan on, take it off, and then reaply the fan, which I'm not sure if that's what would cause it or not). My other guess was that the motherboard pins were bent, but I can't imagine all the other people with my problem would have bent the pins as well. Any ideas?
Thanks in advance.