got my friend's old computer, brought it home plugged it in the light in the back was on. So I turn it on only for it to shut off 4 secs later so i turned it back on again and lasted for 2 secs and now it wont turn on anymore and the green light in the back does light up anymore. I tried differnt outlets and waited a few mins before trying again. Ive come to the conclusion that something is very wrong. Does it sound like the power supply cooked itself?