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1. Click START - ALL PROGRAMS- CATALYST CONTROL CENTER - CCC ADVANCED- GRAPHICS MENU- DESKTOP & DISPLAYS- Click on your monitor avatar- right click PROPERTIES- Ensure Enable GPU Scaling box is ticked- SCALING OPTIONS menu tab- move slider to 0 overscanand and the screen image will increase in size to 100% as you move the slider.
I was having this exact problem, and I just solved it, so hopefully it will work for you.
I went into the monitors settings, and under "input" I changed it from "HDMI AV" to "HDMI PC" and it now scales perfectly!
Try to see if your HDTV has an option that may correct the issue.
I had the same issue you currently have with the desktop being "too big" to fit on the screen when I hooked up my HTPC with a GeForce 9600GT via HDMI. In my LG 47LH90's Picture menu there is an option in the Aspect Ratio field for "Just Scan". This quickly fixed my issue.
Perhaps you can try out different options that controls your HDTV's aspect ratio.