Screen goes black

it was the motherboard for me, i tried all the above then took it to geek squad and they agreed , so i bought anew motherboard worked great for a while about 6 months then that motherboard di d same thing , originally best buy said these gateway had motherboard problems, i guess they were right

i had the same problem, it ended up being a bad stick of ram for me. what you need to do is pull out all of your PCI cards, and try to boot, if it still doesnt boot, pull out a stick of ram (if you have 2) try to boot. if it still doesnt boot, swap out the sticks of ram. if the pc boots after you pull out your PCI cards, put them in one-by-one, if it boots after you put a PCI card in, leave it in, and put another one in. once you find one where it wont boot, scrap that card, it is damaged. if you get all of your PCI cards out, and back in, and it still wont boot, try switching your jumper blocks, you will have to google what jumper blocks are its too hard to explain. if that doesnt work, and you only have one stick of ram, you proably have bad ram. try to find a buddy with good ram and see if he will let you borrow it to try, but make sure it is the same kind of ram. if your buddy's ram works, go out and buy a stick of that ram. if all of the above doesnt work, you have a processor problem, and you are better off buying an brand new pc. because processors arnt cheap, and they are easily damaged. hope this helps.