Problem with My Vizio Lcd Tv?

I have a Vizio flatscreen lcd tv. I've had it for alittle over a year. About two weeks ago the TV went Blue and showed a No Signal screen. I figured the comcast box messed up so I powered down both it(the comcast box) and the tv. When I powered the tv back up I still have the Blue screen. I've hooked another tv up to the box in my room and it plays fine so I don't think it's the comcast box. I had also hooked a dvd player up to the Vizio and it will play DVD's just fine. What could be wrong with it?

Suggestion:

This sounds like a problem at the input of your TV, not the TV itself. You know the Comcast box is good, and you know that the DVD player works okay when you've connected it to one of the auxiliary inputs on the TV.

I would first want to try connecting the Comcast box to the same input where you had the DVD player. The Comcast box works and the DVD player works, so that *must* give you a good picture. I would then experiment with the other inputs (where you normally connect the cable box, as well as others) to see which of them is causing a problem. It could also be a connecting cable issue, or one of the jacks. One way or another, this will be solved thru the cabling or the jacks.