I just started getting weird yellow/blue artifacts (vertical lines) whenever I use my pc. I have an ATI X800XL that is about a year old and haven't adjusted my hardware in months. The artifacts mostly appear during vertical scrolling in IE but are present almost all the time. They are especially bad during DVD/video playback. Any ideas what could be causing this? I reseated the card the other day and blew all of the dust off. Card seems to be running at nominal temperature.