Hello, I am having a problem with my computer, and while I'm pretty sure the motherboard is to blame, I thought I'd check for input before I buy a new one. My computer has been working wonderfully since I built it sometime in May, until yesterday, when I went to turn it on. Here is what happens when I hit the power switch: the computer starts to power up (power LED lights up, fans start spinning, hard drive starts spinning). About 2 seconds after I hit the power button, the computer shuts off, and stays off for about 2-3 seconds; then it will turn itself back on, but of course only for 2 seconds. This cycle of on/off/on/off will continue forever until I either hit the switch on the back of the power supply, OR if I hold down the power button for about 5 seconds. OK, so my first reaction was it had to be a problem with either the motherboard or power supply. The first thing I did was unplug everything from the motherboard, leaving only the CPU attached, the power LED wire, and of course the MB power connector and 12V CPU power connector. I then turned the computer on by shorting the power jumpers. Same result.. the CPU fan would twitch, the power LED would come on.. and then shut off.. turn back on.. rinse, and repeat. The next thing I tried was swapping the power supply with a known working one. Same result. So.. I'm guessing there is something wrong with the motherboard. I've never heard of a problem like this.. it seems quite weird to me. Of course, I'm not too great with computers, so I feel I might be missing something obvious. Any ideas on something I might have missed would be appreciated Otherwise its time for a new motherboard Oh, I don't have another computer that I can test the CPU on... not sure if the CPU could possibly be the problem. System: Gigabyte GA-965P-DS3 Motherboard (rev 3.3) Intel® Core 2 Duo E6600 Mushkin XP2-6400 2x1Gig Antec NeoHE 500W HE Power Supply XFX GeForce 8800 GTS 320MB WD Caviar SE 160GB SATA Thanks for any ideas!