Quote Originally Posted by LeftEyeNine View Post
Also that happens when one or more of those pins of the VGA connector of your monitor (LCDs like mine and CRTs has it) are bent/skewed/broken/missing. Make sure the connector pins (if you have'em that is) are intact.

All signs point to a vga connection issue. The fact that when you changed inputs the problem went away is telling. Maybe just a loose or poorly seated connector....