Can't get computer to post
I am building a new computer and cant get it to post.
ASUS 590sli mobo
2 1Gb Crucial ballistic DIMM
With everything in the case and connected, I can get the system to power up and fans to spin, but no post. I thought it was the mobo shorting so I took it out of the case. With only the cpu fan, 1 DIMM, and power leads to the mobo, I can't get it to post. It powers and spins fans for about 5 seconds then shuts off by itself. I don't know what else to try.
Xion XON-180 Case
OCZ ModXStream 600w 50A on +12V
ASUS M5A99FX Pro R2.0 AM3+ mobo
AMD FX-4170 Zambezi 4.2GHz [stock heatsink]
2 x 4Gb DDR3 1866 G.Skill Sniper RAM
Corsair GT 60Gb SATA3 SSD
Evga GTX 465 GPU
Windows 7 Premium