I'm in the process of installing snow on my very first hackintosh. I have a bootable USB drive which is working properly up to the point of the grey apple screen. it seems like it starts to load properly, but after about a minute, my display just turns off (no video feed). I'm not sure if its still loading in the background, (booting from USB, so no activity lights are blinking at all) but the computer stays on indefinitely, and the display just sleeps.

System is configured:
Gigabyte EP45-UD3LR board
C2D E7400
Nvidia GTX260
Sony SATA DVD combo-drive
4GB DDR2
WD 640 Black drive

Also, I have inserted the hex efi string for the gtx260 in the com.boot.Apple.plist file, but as I said: first experience with a hackintosh, so I'm flying blind!
Thanks for ANY help!