Hello. I have a HP media center pc that recently stopped working. I put a new graphics card on it and installed Windows 7, but besides that it's stock. What happened is when I turned it on, it would work fine for a little while then the screen would go black and the power switch would flash from orange to blue. I would then kill it's power, and restart it. It would do the same thing but die even faster. Now it's to the point where I can't even turn it on, it just instantly does the power flashing thing. I'm going to let it sit for a little while in case it overheated, but I don't think that is the problem. Thanks