I recently switched all my components into a new case. I had a GeForce GPU installed before the swap. I dont need it anymore so, I've decided to remove it. When I try and use the on board graphics from HDMI a green screen flashes and no display is shown.. Everything seems to boot up fine.. I dont know if I needed to plug the hard drive into the same slot on the MOBO or not. Should I just install the old GPU and continue using it? I don't understand why it won't revert to on board graphics. I hear the hard drive cranking like its booting up. I figure atleast the bios should show.. What should I do?