DD-A300GX trouble in setup

After checking everything they suggest in the manual, I can’t get the screen to come up on my TV. In TV mode, I can get the channels to change and even the “record” button seems to work.

I assume that, unlike a VCR, the TV doesn’t have to be on a specific channel to switch to TV mode, yes? They mention something about incompatible TVs. Do you know where I can find a copy of this list?

Thanks much.