sounds like you fried the power supply. have you had any lightning storms recently? i would take it to best buy and have them run a test to see if your psu is fried or if the rest of the components got fried also. this happened to me last year i had my pc running while a thunderstorm was ongoing and it fried my whole system sadly. i hop this is not the issue for you as you would have to build a whole new computer. lets pray it is the psu that is the problem.