New rebuild endless reboot cycle, HELP!!!!!!!!

I've only just today swapped out my old Q6600 and replaced it with an i7 920 on a gigabyte EX58 UD4P motherboard, with a 6GB Kingston Hyper X DDR3 1600 Ram kit. All the connections seem to be in the right place, but when I boot up I get to the windows loading screen where it'll flash to a blue screen for a second then reboot, and continues to do so... during which point when it says windows didn't start properly, is there a hardware change recently etc and asks me to chose an option, my keyboard doesn't respond, where as everywhere else it would. Is there a reason for this endless reboot cycle? Is it ram related or is it merely the fact that I must reinstall windows hence it asking about the hardware change? I took it all out and reinstalled the Q6600 and it all worked fine... HELP PLEASE!!!!!!!

Nah man, fresh install of windows fixed it all, the new build is running like a beast now, oh and yeah it defs wasn't the power supply, I'm running an Antec TPQ 850W, thanks anyway!