I have used my desktop in conjunction with my desk top dell (ati card with dvi to component adapter) to display on my HDTV. It's a direct view philips 30" wide. Here's my problem. I get large horizontal lines (2 to 3 inches vertically, the whole way across the screen) scrolling from top to bottom. They take time to fade away even after I disconnect the computer. And they appear on every input/source. Does anyone have any suggestions?? Thanks in advance.