Is this a power supply problem?

[Dilpil]

I got a new computer a while ago, built it myself. Just took it home to philly, and It won't stay on for more than a minute- after a bit, it simply shuts off. I checked to see if it was something outside the computer (cord, outlet, ect.), and I have concluded it is not. Anyone have any idea what the problem could be? Specs following:

Sunbeam PSU-BKS580-US ATX 580W Power Supply
Western Digital Caviar 250GB 7200 RPM IDE Ultra ATA100 Hard Drive
Intel Core 2 Duo E6300 Conroe 1.86GHz LGA 775 Processor
ASUS P5L-MX LGA 775 Intel 945G Micro ATX Intel Motherboard
EVGA GeForce 7600GT 256MB GDDR3 PCI Express x16 Video Card
Kingston 1GB 240-Pin DDR2 SDRAM DDR2 667 Memory x 2
Lightscribe DVD burner

Any ideas? Thanks in advance.

 

[alcattle]

First I would check the CPU fan. It might have jarred loose in the move. If it gives at all, re-do the thermal paste.

 

[Dilpil]

...appears to work.

Million thanks, love you forever.

 

[hunter_green32]

Does it reboot, or turn off and stay off?

 

[uwisuwerme7]

I would reseat all parts ie. cpu, memory, video card. But it could possible be a bad PSU as well.