I have a 1st gen Harley-Davidson, when powering up the DMD only turns on for a few moments during which it displays the game name and display ROM version. It then goes dark and shows nothing again. The game boots as normal. I switched out the display controller board with a known good one swapping the ROMs and am still getting the same issue. I also changed out the ribbon cable and DMD itself to test it, same behavior where it shows the display version for a few moments and then turns off.
I have double-checked all the cables are correctly connected and pushed on the ROMs to ensure they are seated on the CPU and display controller board.
I do not get what the issue could be. Any thoughts? Thank so much for the help!