Do you still have the DVI TV so that you can confirm that that still does work OK? If so, I suspect that there actually is some problem with the daughterboard that failed to show up for some reason when driving a DVI device (although I have no idea why that should occur). Otherwise, I would first make sure that the daughterboard is firmly seated on the MDP120 and then try a couple of different DVI-HDMI cables to eliminate those as problem sources.
A very long number of years ago I tried to connect an old graphics card that that has been replaced using a DVI to HDMI adapter.
I got a low resolutation picture on my HDTV pixalated with wrong colors. Using the DVI to DVI produced a great picture from the same graphics card. HDMI from both my laptops and newer graphics card all are looking great (With some sync problems).
I remember finding that the problem was that at point in XP's life that the necessary handshaking over HDMI was not in the OS and that the HDTV produced the low quality picture to indicate something was wrong with the handshaking.
Blame it all on Hollywood!
In trying to search for the right words posted by someone else I found this old post:
http://en.wikipedia.org/wiki/HDMI and other search results came up with many things that may be wrong.
MyHD is so old that the handshaking cannot be expected which has been said before.
The number of HDMI versions boggles the mind.
My HDTV will not boot (correct term) when a Dual channel DVI cable is used. I was about to pack up my HTPC and return from Microcenter when I spotted that the tech was using a single channel DVI cable and I had purchased a dual channel one for use with my HDTV.
I did want to make sure that I said thank you to everyone that has replied to help out. In particular you, TPeterson. I think it is great that you spend so much time and effort on these forums helping people out the way you do(almost 12,000 posts is amazing). Thank you again.
Yamaha 5.1 Surround Speakers
Logitech Harmony 1100
Raspberry Pi running OpenELEC XBMC