I'm wondering if anyone has seen these symptoms on a ColorDMD?
I'm not sure if you can see it on the image, but when the game boots, most of the time there is a row of various colored dots at the top of the display, but that's it. Occasionally there is nothing.
This seemed to happen after the bigger header pin disconnected when trying to remove the speaker/DMD panel when the game was powered on.
I have replaced the DMD Driver Board with a rottendog board (Using the ROM from the old one), but have the same symptom. I also updated the ColorDMD board via USB and it seemed to do what it was supposed too.
I have checked all the cables multiple times. ColorDMD is Rev 1.3b and the DMD Rom is V3 in case it matters.