New build wont boot- Please Help

Intel Core i5 750
EVGA 896-P3-1171-AR GeForce GTX 275
G.SKILL Ripjaws Series 4GB
Sony Optiarc DVD Burner
Seagate Barracuda 7200.12 ST31000528AS
COOLER MASTER Intel Core i5 & Intel Core i7 compatible RR-B10-212P-GP 120mm "heatpipe direct contact"
ASUS P7P55D PRO LGA 1156 Intel P55 ATX Intel Motherboard

Everything went together easily. However, once I button it all up, plug it in, hit the power switch- NOTHING happens. Nothing turns on, no fans, not the hard drive, nothing. The only change is the boot LED on the mobo lights up green. I've checked everything 3 times and all of the connections are good. Any help with what might be causing this would be a HUGE help. Thanks
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More about build wont boot help
  1. ^+1...

    It sounds like you don't have the case power connector plugged in correctly.
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