One file that can easily make or break your video, is /etc/X11/xorg.conf and one of the most common things to have to edit is the vertical refresh, or the resolution lines. for instance my tv doesn't like 1600x1200, and every time I did this how-to on this particular pc, I had to remove the 1600x1200 from the xorg.conf before it would work right, but this is not going to happen to everyone.