Cyberpower prebuilt help!

[darthd]

Ok guys, so I'm working on a cyberpower prebuilt system for someone. Specs are:

 

Asus p6t  LGA 1366

idk cpu because i've never had it all the way booted. (possibly a 920)

dual evga GTX 280s

12GB corsair dominator memory

120mm asetek liquid cooler

windows 7 home premium

1000w psu, cant see brand.

 

Here's what's happened so far. I plugged it up and it booted to the windows login screen. I put in a disk to run ophcrack to find the password (so I wouldn't have to call someone). The CD is not corrupted because it worked on my desktop. I reboot it and go into the bios and then it shuts down randomly, I didn't change anything. I press the power button and it does nothing. Then I unplugged the cpu, gpu, and mobo power. I tested the psu and all the voltages were good. I cleared the CMOS and still nothing.

 

Since then it has turned on (by itself), ran for like 15 seconds and then shut down all by itself. I'm at a loss for what to do now. Should I take the second gpu and some of the memory out to run it as barebones as possible or did I somehow brick the bios? Thanks for your help. And I did read the sticky.

 

[legopc]

run it with mobo and cpu only 

[darthd]

Without the ram too? Sorry i'm late responding. I'm not home so i'll report back later if that worked.

[darthd]

Alright, I did as suggested and it turned on for like 3 seconds then off.

[Kev]

Something shorting the mobo?

[darthd]

When I woke up this morning it was running (turned on all by itself) but there's nothing on the display. Also, the radiator fan is dead so it could've been overheating.