I just picked up a Demo Man and am having an issue with the display. I have tested the DMD itself, and it works no problem. When I turn the machine on it will make the sound as if it is booting, but will not allow a game to start. When I press exit on the coin door after start up it will go into attract mode, but still the display remains blank. Once I get to this point I can add credits, start a game, and it plays with no issues. Any help is greatly appreciated.