Have to cycle power on restart

So I had my computer overclocked (computer in my sig) I had some problems and had to reset my CMOS. I updated the bios to the most recent version. When I am loaded to windows, I restart the computer, and the computer doesn't post. I have to hold the power down for 4 seconds to shut the computer off completely and start it back up to post. This happens no matter how I restart the computer. If I am in the bios and exit, I have to cycle the power to get it to run.

Where should I be looking to fix this problem? Updating the bios didn't fix anything, and I am no longer overclocking anything. All the voltages, fsb and memory speeds are set to auto or stock.

If you can, try a different power supply, or strip the system down to CPU/RAM/VIDEO and see if the problem remains. If all else fails, try reseating RAM and expansion cards.