I have recently bought a new PC and have put it together. When I connect the DVI cable from the monitor to the graphics card, the monitor says there is no signal coming from the computer. But I don't think the problem is the graphic card because the USB ports don't work. I have taken the motherboard out and put it back again once. Still the same results. Any idea on how to solve this? This is my build: http://pcpartpicker.com/list/BRR9tJ