New computer won't turn on

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built new computer but it won't turn on

Hi i'm new to this board.
I just built a new computer, all parts were new, and all tested to work.

It has a an ASUS A8N5X Socket 939 NVIDIA nForce4 ATX AMD Motherboard

XFX PVT42EUDE3 Geforce 6800XT 256MB GDDR3 PCI Express x16 Video Card

AMD Athlon 64 X2 4400+ Toledo 2.2GHz Socket 939 Processor Model

2 GB Memory

TV Tuner

500 Gb HD SATA

Antec Sonata Case with 450 w PSU.

I built everything, and hooked it up. When I press the power button a small zap noise comes from the PSU and then nothing happens. The green light turns on so the motherboard is getting power.

-I have built computers before and have never come across this problem.
*This is my 2nd motherboard and 2nd PSU (I thought they were the problem so returned them and got 2 new replacements but same thing is happening). I've tried everything and don't know what to do.

PLEASE HELP ME
 
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