I have been having the problem where my computer turns on fine but the monitor stays black. I have narrowed it down to being a problem with the graphics card though because when unplug the graphics card's power and plug the DVI cable into the integrated graphics card, it works fine. I know it isn't a fried PCI Express port because I tried the next one down on the motherboard and it still wouldn't work. The monitor is still black when I have the power plugged into the graphics card and the DVI cable plugged into the integrated graphics. At this point I think that it might be a problem with the graphics card that requires I send it back but what is weird is that the graphics card powers on and the fans run but the screen remains black.