new system not working

[icecold1983]

just built a system based on nvidia 680i/core 2 duo with an 8800 gtx. anyways i get it alla ssembled and u power it up and theres a pretyt loud clicking, it seem slike its coming from the psu which is a zalman zm600. im also not getting a display on my monitor. all the fans spin in the system/cpu/video card and i hear the post beep, and the motherbard led reports everything is in working order.

called evga and they said its most likely the psu or the video card, im wondering if any of u have ever seen this before.