The other day I started up the pc I just built and the BIOS came up. The problem was my mouse and keyboard that were plugged into the USB 3.0 slots didnt turn on. When I went to power my computer down, I pressed the power button and it didn't shut down. I pressed the power button repeatedly, still nothing. So, I pressed the restart button, nothing. I pressed the restart button repeatedly and it restarted. The problem is that my computer now turns on for two seconds then turns off again and does that over and over again until I turn off the psu. Is my psu dead? Did I damage any hardware? Also, the USB 3.0 problem was I broke one of the pins trying to reroute the cable. I did not have a graphics card in the computer at the time. I have everything else installed though.