ATI hd5700 hdmi problem with LG hdtv

I'm connecting my grapic card with HDMI cable to my new LG HDTV (37cs560y). The problem is that I can't raise the resolution above 1280x720. Also. picture and video are in very low qualiy.
I'm sure that the probelm is with the graphic card HDMI output. I know this because I've connected the TV to another computer (with a low budget grapic card) and everything worked fine.
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  1. Is there q question in there somewhere?
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