New build- Will not turn on at all, help!

I just got my parts in, put it all together but my PC will not turn on at all when I hit the power. The front led lights up for a split second, makes a click noise, then off..... Pressing the power again does nothing, unless I hit the kill switch on the PS off, then back on. When I do this, and press the front power again, same thing, a blink of light, then dead. No fans turn on, and no other lights. Nothing lights up when the kill switch is turned on either (no keyboard leds or anything at all.


Parts used--

thermaltake 500W PS (most likely suspect?)
E8400 CPU
Gigabyte DS3L mobo (rev.2)
2gb ddr800 ram (pc6400)
8800GTS 512mb
Stock heatsink\fan
250gb HD
floppy


I unplugged almost everything, leaving only the CPU,MOBO, and CPU fan plugged in. Nothing I am trying is working! I played with the pins, making sure they weren't in backwards even. Everything is brand new, not used, so I am clueless as to what to do. I don't have fancy equipment either to test currents.

hmm something must be shorting it somewhere, I am gona try the mobo on the cardboard method =)