Radeon 9700 and Television

I'm trying to hook my computer with a Radeon 9700 Pro up to a Sony LCD Projection TV with a DVI to HDMI cable. When I sucessfully get the system to recognize the display, however, It won't let me change the resolution. It locks it to either 640x480 or 800x600 (Don't remember which). If I select "Force 720P Mode" somewhere in the advanced display options, it looks much better, but the resolution still isn't perfectly what it should be, the sides of the screen get cut off, and I still can't change any of it. Any thoughts?

 

Get the latest ATI drivers. I had the same problem with my projection TV and the new drivers have a bigger resolution range. Use PowerStrip for further adjustment if necessary

 

I do have the latest drivers, but I will try powerstrip and see what I can do with that.