Newly built computer won't start, need help!!

[ashenromance]

I just finished building my computer and when I turned it on everything (fans, lights, etc.) started for a second and then shut right back off. Please help!


Specs:

ASUS M4A78T-E AM3 AMD 790GX HDMI ATX AMD Motherboard

AMD Phenom II X4 945 Deneb 3.0GHz Socket AM3 125W Quad-Core Processor Model HDX945FBGIBOX

Patriot Viper 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Dual Channel Kit Desktop Memory Model PVS34G1333LLKN

HIS H489F1GP Radeon HD 4890 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card

CORSAIR CMPSU-650TX 650W ATX12V / EPS12V SLI Ready CrossFire Ready 80 PLUS Certified Active PFC Compatible with Core i7

SAMSUNG Black 22X DVD Burner Black SATA Model SH-S223B

 

[hunter315]

Have you gone through this checklist yet?
http://www.tomshardware.com/forum/261145-31-read-posting-boot-problems