Re: Dell xps screen glitching. Help!
Awesome! Since that fixed it, you may have had a loose ribbon cable (the cable that connects the display to the card / board). I've seen these ribbons come loose for a number of reasons, but loose / broken hinges is often the culprit. As the hinges loosen or crack, they cause excess tension as the screen is moved. This over time can cause the ribbon to become loose, or in worst case scenarios even tear.
Fortunately, a ribbon replacement is easy if it ever does tear. Though if I were you, I'd inspect those hinges and check for cracks. :-)
Oh, and you should get the latest video driver online (as opposed to installing the original driver). More than likely, a newer version has come out since, and will provide better performance for your machine.