I can't tell if all you need is a video card with the usual HDMI output yet. Let's start with my favorite list -> http://www.tomshardware.com/reviews/Best-Graphics-Card,2011.html
I purchased HP make w2207h HDMI monitor. My PC does not support it. What I supposed to do to upgrade my PC? Is it only the VGA card I have to change or the whole system? Anybody can help. I dont know the Hardware configuration of my PC.