A while ago my computer crashed in the middle of a game and then wouldn't boot up from that point onwards. I'd turn the power on and nothing would come up on screen, monitor light would just stay orange instead of going green.

I mistakenly took this for a problem with the motherboard and bought a new motherboard. Installed it, booted up, still nothing. Tried putting a different PCI-Express graphics card in, et voila, it worked, I should've tested that before buying the motherboard, yeah, but nevermind. I'd isolated my graphics card as the problem and went ahead and bought a GeForce 9600GT.

It arrived today. I put it in. My computer doesn't boot up.