I just removed and put my graphics card in because it was clotted with dust and then I switched my PC on then nothing happened. It wouldn't boot from the graphics card at all, then I tried from the on-board graphics and it was fine. It doesn't come up in device manager unless I show hidden items, I'm using Windows 8 at the moment. The graphics card is all plugged in and it switches on fine but it just won't boot. Please can someone help me