i just built my new computer, and when it first booted up, it was fine, but the monitor cant seem to find its signal. so, i rebooted the computer, but this boot failed. when i pressed the power switch, only the cpu cooler fan will run for 1 second, then turn off. and nothing else happens. did i fry the cpu from the first boot? or did the motherboard fail? or did i plug something in wrong? please help.