New Build Boot Problem - Turns Off and On Every 3ish Seconds

[FooS24]

Will list specs first.


SAMSUNG Spinpoint F1 HD753LJ 750GB 7200 RPM SATA 3.0Gb/s Hard Drive - OEM

EVGA 896-P3-1257-AR GeForce GTX 260 Core 216 Superclocked Edition 896MB 448-bit GDDR3 PCI Express 2.0 x16 HDCP

Intel Core 2 Quad Q6600 Kentsfield 2.4GHz LGA 775 Quad-Core Processor Model BX80562Q6600 - Retail

OCZ SLI-Ready Edition 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model OCZ2N800SR4GK - Retail

GIGABYTE GA-EP45-UD3P LGA 775 Intel P45 ATX Intel Motherboard - Retail

Antec NeoPower 550 550W ATX12V SLI Certified CrossFire Ready Active PFC Power Supply - Retail


So thats my rig. I go to start it up and it turns on for about 1-2 seconds and then automatically shuts off, nothing fully fires up and therefore nothing appears on the monitor. About 2-3 seconds later it automatically starts back up and proceeds to shut down again. This is repeated until I flip the switch on the PSU. I have un built it and put it back together on cardboard. Same error occurs. I tested one of the PSU cables and it was coming out to correct voltage. I'm all out of ideas, I have reseated the heatsink as well. If anyone has an ideas or things to try let me know. Thanks in advance.

 

[dandragonrage]

What if you try booting it without any drives or addon cards? This includes video card. Of course you won't get video that way, but you'll still be able to tell if it shuts back off.

 

[FooS24]

tried that, same result. is there anyway to test memory?

 

[Dangman]

Reset CMOS?
Did you plug in all of the necessary power cables?

 

[FooS24]

did and yes

 

[dandragonrage]

How about with just one stick of RAM?

 

[FooS24]

tried that too

 

[FooS24]

any other ideas?

 

[aingeal]

run memtest and see if you get any errors

 

[FooS24]

just tried a new PSU, same result.

 

[Dangman]

Try another motherboard.