supply if my computer won't turn on? Okay as said before is it my motherboard or power supply (most likely) if when i plug in the cord a green light goes on for a second then goes off and I press the button and nothing will work, I also want to know if it'd be pointless to go to the geek squad people and for $60 have a diagnostic because if it is the motherboard that’d be a waste of money. If it is the mother board is there any possible way to get documents off of it and onto another computer… or is it just dead?