@txrose - My onkyo + dvd only have component output, and for my TV (which is wall mounted) I had to thread cables through a small aperture in the masonry too small for component (so I fit hdmi cables). The TV only has 1 HDMI input (used for the cable signal) and 2 DVI inputs.
I assume you have the same problem with either DVI input on the monitor.
Since the actual DVI and HDMI video protocols are the same and just use different pin connectors there is not reason for you to have a problem.
Check your DVI connector connections again. Be sure and not screw down one end of the connectors all the way before you screw down the other end or the cable will be cocked and will not connect all the pins. Take a few screw turns at a time on each end of the connectors.