An s video cable is the worst quality way to hook it up. An dvi to hdmi wont work either. I bought a Samsung tv and wanted to hook up my new computer that had the Nvidia graphics card and went through what you are. What I found best after being on the phone with Dell for 2 hours a day for a month strait was that the "VGA" hook up is by far the best quality for what your trying to do. To adjust the resalution of the video card just go to it in your computer and it has many options for you to try to get the best picture.