lol yeah with the ultra his only option is DVI well besides the analog-DVI adaptor he's obviously having to use for now. How long have you had that monitor? Just read the specs on it and whatnot.....bunk monitor maybe? Unless you've had it at 1600x1200 on DVI for a long time up until you got that 6800. This HP flatscreen monitor I'm on now is the 2nd one...the first one we received half the screen would show lines through it...returned it and this one works perfectly....so maybe thats it?
Some cards can't handle DVI at max resolutions.
He's telling you that Yeah...your Ultra has the DVI connectors but perhaps it isn't capable of handling that 1600x1200 resolution on DVI see what I'm sayin? So it could be the fact that the card just doesn't want to and cant handle that high of a resolution on DVI...maybe your refresh rate is too high with the resolution you are running at. Some monitor will only allow a certain refresh rate depending on how high the resolution is set. Try lowering the refresh rate one level below whatever its at right now and see if that does anything. Normally it'll just hide options that can't be chosen but its worth a shot