Yes it would be a very good idea. It makes sense to do so. Apart from the fact you are achieving compatibility with the card and the screen, the cable is lighter. The video quality is the same as DVI but much better than VGA. Also if you want to watch Blu Ray on your machine then you will have a compatible card and screen. A lot of disks won't play unless they recognize HDMI technology. It is possible it may deal with over scan. Just make sure the screen is set to its default resolution. If you still have problems after that it is likley software / driver / configuration issue as you have just replaced both card and screen.