(Solved) Power supply dead? My computer turned off by itself and I haven't been able to turn it back on since. I'm thinking it might be the power supply. 480w atx sata AG2 power supply. I pulled the power supply out, cleaned it and the inside of the computer, hooked everything back up but, still dosen't turn on. Could someone possible help me here? I replaced the psu and now it's running. Thanks for the help.