You might have to download some drivers, but that is very unlikely. The problem is probably you DVI-HDMI Cable, check if it works on another monitor or something and see if the cable is faulty.
Thank you for your reply! I appreciate it. The cable does work. I initially had it running to my monitor, and it worked fine. The only real difference is that I'm having to use a connector to join that cable to a pure HDMI cable so I can get it to the TV.