I press the power button, and it starts turning on. As soon as the light on the screen turns green, the system shuts off. I press the power button again, and nothing. For it to do that cycle again, I need to shut off the PSU, wait for all the power to leave the board, and turn the PSU on again. Is this a problem with my PSU or motherboard? Yesterday computer wouldn't boot, but i figured that out, it was because I had an extra riser that wasn't supposed to be there. Any help is greatly appreciated. Thanks 