I got a new computer. The old computer was perfectly fine when I unhooked it from monitor. I took it to another spare monitor to hook it up to do a clean install of Windows in order to sell it.When I hook it up to monitor I have no video. The video card is onboard so it can't be loose from moving computer 100 feet from upstairs to downstairs. The cables are fine as well because when I hook the monitor up to my laptop's VGA port I have video. To me this eliminates monitor and cables. How could the video port go bad in this move? The computer is an I5 and still very fast. I doubt the power supply on these HP's would handle any kind of dedicated graphics cards from what I have read. The computer is an HP Pro 3500. Could it be that video port for no reason by just unhooking and rehooking it up lose the video? Doesn't make sense to me. Anyone?