When I switched from a vga monitor to my 40 inch lcd all I had to do was: delete the old xorg.conf, shut the system down, unplug monitor, plug in tv, and reboot. Centos 5 then built a working xorg for me. I then had to select the proper resolution. This was all on a nvidia Geforce2(not exactly a new card) using prebuilt rpms(livna has them for F8). You would probably get a better picture if you stick with 720p (unless you have 1080p available) rather than 1080i.