Sorry to hear you are having troubles:
First: Though time-consuming and frustrating, always remove potential power from your system prior to making changes on the MoBo. This is as simple as unplugging the power cord from the AC outlet to your PSU.
Have you used all available stand-off receptacles on the MoBo? Most ATX boards use 9-10. Sometimes these standoffs double as grounds. I would not attempt to use insulators as the components are designed to contact as follows: MoBo > standoff > case.
Did you macke sure that your 4-pin ATX power is connected? It usually connects at the "top" of the board near the CPU socket.
Did you make sure that your PSU is turned on. (No offense, but it is a minor detail that is sometimes overlooked.
Try unpuggling all your components and just have the MoBo powered on (20/24 pin + 4pin) and the CPU HSF, does the CPU fan spin? Check the internet for the appropriate process of elimination.
Try another PSU if you can get one.
[SIZE=\"1\"]E6400 @ 3.4 , Noctua 120
7900GT @ 670/1680 , VF900
2 x 1GB Patriot 6400 @ 425
WD SATA 250GB
Neo HE 550
P180 / G15 / MX1000[/SIZE]