Well, I turned my computer on earlier, left to the store, came back and it was turned off. I asked if anybody had touched it or even gone near it they assured me that they did not. I tried to turn it on again but no go. I looked at the side my case and all of the sudden a red explosion cracked from what seemed to be the space of air between my power supply and my dvd drive, followed by two or three slightly quiter cracking explosion sounds, and bright white sparks. My PC will not turn on now ( obviously ), so a friend and I replaced the power supply with a bigger (550 watt compared to the previos 350) and it still will not turn on.