I should ask, is there any post beep? And another possibility is your video. If it's onboard video, try obtaining a video card assuming you have a card slot availiable. If it's not onboard video you're using, and you're already using a card, you have 2 options. A: once again, try another video card in your video slot, and B: if you are using a video card, but have an onboard video option, test the onboard video. If this all fails, I would again assume it's the motherboard.