Ive just recently built a new computer with a friend and the end result is filled with disappointment. The resolution on my LG 37LE5300 hdtv 1080p came out horrible as it is fuzzy and it doesn't even fit the whole TV screen. My old computer with AMD athlon II and gtx 9800 graphic card produced a perfect 1920x1080 resolution.
It's possible that the crossfire is screwing it up. Also make sure the refresh rates on your PC display properties match exactly to the refresh rates of your TV. Check the TV manual to find out what they are.
I would start by:
1) Match the refresh rates, using direct HDMI out.
2) If that doesn't work, keep the refresh rates and remove one card from the system and see if that works.
ok cool. dalmvern you have solved my fullscreen problem. but the shitty graphics and resolution still exist. The words on my 37" are still really blurry and the icons are extremely small for a normal size.