I can't speak to anything before MKIII (the first version launched in the US), but every DVI socket I've ever seen on a B&O television has been an output. This may be the issue. Don't know, though.
If it turns out to be an input, then you could cycle resolutions and see which one works.
There is scarcely anything in this world that some man cannot make a little worse and sell a little more cheaply. The person who buys on price alone is this man's lawful prey. - John Ruskin