Just finished my build with a ATI 5850 graphics card. When plugged into my samsung 40' tv via hdmi, it leaves about a 1/2'' gap on all sides of the screen. My tv offers 16:9 or "just scan" and "just scan" makes the display shrink more. Any thoughts? I'm running windows 7 64bit.
This could also be a setting issue with your TV. When I first setup my TV it showed the computer as being oversized by about an inch. Make sure you are setting the TV to show the screen as native if possible and not scales or widescreen.