I had problems w/ no video when computer starts. I just installed a new video card and now get video. But then when I start my system after its been off for a while there will be no video, I restart it and video then appears. I can restart, shut down and startup as many times consecutively and I will have no issues. But when I start the computer after its been off for more than a couple hours I will again get no video until I restart it. Any suggestions? Could it be another video card issue or is it my system?