I built my desktop computer awhile ago, and I just came back from a week of being out of town. I turned it off before i left and when i came back I turned it in to start playing some games and when i came back into the room i noticed my screen was still black and my keyboard and mouse weren't lit up either. It looks like everything else in the tower comes on i hear all the fans start spinning like normal, and i have switched plug ins and such and still nothing i plug into my computer works. any and all help would be great please?!