New resolution problem when connecting HDMI to TV

We have a g6 Pavillion and we were happily watching Netflix movies on our sharp HD 1080i TV via an HDMI cable... until very recently.   Now all of a sudden we get a message when we try to run Netflix that the resolution is too low and it will not launch the application.  When the HDMI cable is unplugged, the resolution on the computer is 1366 X 768.  As soon as I plug the HDMI cable, it falls to 1280 X 720, and I don't see any way to fix it.  The TV shows 1080i by looking at the other entries. It gives no exact resolution, but there must be better than 720.  As soon as I plug the HDMI from laptop, television shows 720 resolution of entry.  So I suspect that this is a problem on the side of the computer.  The strange thing is that it worked fine before.  Any ideas out there?

If I were you, I would make sure that you use the "Extended desktop" mode and the TV screen is on it's native resolution in the Properties window.

Using extended desktop allows displays to have independent resolutions that you can adjust to your liking.

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