Came home, walked in and noticed my PC was off. monitor was on, speakers on, modem everything on as if the power had blinked out for a sec and my system had shutdown. I pressed the power button on the front and got nothing. i checked the power supply's own power on/off switch on the back and got nothing. no light that its on or anything. thought maybe it was the cable so i plugged it into my other pc and the cable works, so i'm thinking maybe the psu went bad or took a hit. Im guessing i just need to replace it. How difficult is it to replace it by yourself. i've never done that before and do you think that its the psu at fault? I'm thinking that if there is not power on light, then something is wrong big with it. my heat temps stay down between 28C and 34C at the highest. Also, can i replace it with just any other 600w power supply or does it need to be a specific kind. company i bought it from online listed it as dual core certified 600w psu. no mention of 12v rail or anything else. i guess i can get that from them if they have it on file.