need help, new build wont turn on. possible short?

[captain9]

I just put everything together for a new build (first time) and nervously pressed the on button and for a fraction of a second, the fans will turn and ill see led's light, but then it shuts off.. i'm at a complete loss as to where to go from here.

I tested my PSU through the manufacturers online faq http://www.pcpower.com/support/ATX_troubleshoot.htm and it appears to be operating normally.

anyone have advise on how i could troubleshoot this? or any good online resources for first time builders?

Thanks in advance

Coolmaster CM 690 case
PC power and cooling silencer 750w
intel core 2 duo E8500 3.16ghz
asus p5q pro
radeon hd 4870 x2
g.skill 2g x2
LiteOn DVD burner
Western dig sata 3.0 ghz, 640gb

 

[auscanzukus]

Clear cmos for 10 mins with power cord unplugged. Try each stick of ram in each slot. If no luck, strip the build to a barebone on the mobo box and hot wire it by shorting the PWRSW pins with the tip of a ball pen. See manual for its location.