Trouble connecting TV to laptop via HDMI

[Dr. Gigglepants]

As of about a week ago, I can no longer get my laptop display to extend to our HDTV. It has always just worked when I plug in the HDMI cable, until the last couple times I've tried it. I have an Asus laptop with Windows 7, and a Dynex TV, I've attached a screenshot with some information regarding my PC, and the device manager window open.

Any suggestions welcome, for some reason I haven't had any luck searching for a solution to what I think would have to be a fairly common problem.

Thanks!