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Newly built computer shuts on then off within seconds!?

onboard graphics card, but if computer didn't boot I was going to try using [BFG Tech]GEFORCE 7950 GT OC
AMD Athlon II quad core
3 x 2gb DDR2-800 CL4 Ballistix Tracer Red
650W blustar PSU
*Everything is new, the only thing that is used is the graphics card*

I just put together this new computer. I haven't even put an OS in it yet. I turned on the computer and everything was working so smoothly for about 30 minutes, then out of nowhere it turned off. When I tried turning it back on the fans and led lights would turn on for about 1-2 seconds then shuts off (so basically everything turns on then off within seconds) it won?t stay on, however when I have the PSU on the little green LED light on my motherboard stays on and as soon as I turn off the PSU the motherboard's LED light will go out so I don't think it's the motherboard but I could be wrong. Everything is compatible with the motherboard I've checked thoroughly. I also took the motherboard out of the case and looked for any dark marks I also smelled it, and see no signs of the motherboard being burned out. I double checked all wiring and hardware components and tried it, still the same.
UPDATE:I tried turning it back on but the fans and led lights are not turning on at all.but the little green LED on the motherboard is still working fine. HELP PLEASE .

UPDATE:I posted this a couple of days ago,and thought the problem was because i was using the wrong ram.So i went out and bought the right ram.I put everything back together and tried to start the computer but i'm still having the same problem.I don't think it's the PSU because i have 2 and tried them both and still the same.I'm wondering if it's the motherboard because when i first placed the motherboard in the tower i did it without the standoffs.My bf thinks that i may have fried it.But if that was the case then would the little green led still be functioning?

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