power off your pc. make sure it unplugged from the wall. let the mb drain. the error looks like there may be a wire in the gpu fan or the gpu power plug not seated right or the gpu needs to be seated. i would pull the video card and reset it and check that there no wires in it or the cpu fan. make sure everything still plugged in. if the system still hangs try booting the system from onboard gpu if you have one.