Look again in the driver for a TV setting. What card are you using....Nvidia or AMD? I know AMD has settings for setting up a TV because I have two 6970s running in crossfire, I looked and they are there.
Did you use the TVs menu to tell it that you are inputting with a PC?
The graphics card I'm using is a AMD Radeon 6570 according to the devce manager which also has Intel HD Graphics 4000 listed in the section for display adapter.
The TV automatically detected the computer hooked up to the TV although I'm not to sue if I've done it right. In the past, I had no problems with the correct display.
EDIT: I accessed the 'Screen Adjustment' option in the TV menu and the 16:9 mode works fine for TV viewing and PC viewing in the past, but it doesn't seem to work now whereas if I switch the picture mode to 'Screen Fit', it works.