Weird issue with mobo and Radeon 5770

Shuk

n00b
Joined
Jul 8, 2009
Messages
33
Hey guys, I just finished building a brand new system with:

-Antec CP-850 power supply
-Asus P7P55D Motherboard
-Intel Core i5-750
-Cooler Master Hyper 212
-Sapphire Radeon 5770 Vapor-X

I plugged everything in but my computer won't start. There is only a click and the fans won't power up and there is no sign of action EXCEPT:

-The motherboard standby LED is green (indicating ready to go)
-The blue "S" logo on the top of the 5770 lights up for a quick second and then shuts down. However, research tells me the symptom of nothing turning on is a PSU or mobo issue, but what's with the graphics card lighting up?
 
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