Hello when I say it won't start up I mean that when I press the power button it makes all the same noises as usual fans whurring an whatnot but nothing shows up on the screen. Everything seems to be getting power indeed I've even tried starting it with a different power supply. Actually I've replaced almost everything except for the mother board and the dvd thing.
As for what I've done in regards to your previous post I didn't get very far before it stopped working. I did decide to just re-install windows and after only installing a few drivers( video card,ethernet controller,and some realtek driver that I quite remember what was for) it crashed and wouldn't start up again. The computer not starting up again wasn't exactly out of the ordinary but this time I cannot get it to start up again at all, whereas previously it would fight me for awhile but eventually work. The only thing I did that might have had something to do with it other than the drivers, is that I changed the "write debugging information" setting from write kernel memory dump to write small memory dump( under the advanced page of system properties.
p.s. there is a green light on the motherboard if that's what you mean by lit up.
p.s.s. sorry about my previous post It was posted in haste and I apologize if it seemed rude.