If the tilt light is flashing on and off during start up, it's possible that there is a game ROM issue. Either a bad game ROM socket connection or maybe a corrupt game ROM itself. Try booting the game without the game ROM installed and see if the results looks the same as what you saw before. If it looks the same, you can try to force boot the game by holding the test button down for about 15 seconds (without the game ROM). If the CPU board doesn't have any other issues, it will boot to attract mode. You will be able to run tests, you just won't be able to play a game.

Steve
System 80, not just a job, it's an adventure

I believe that any aftermarket boards should be supported by those that made them. It looks like I need to ask which boards are being used in the game before I attempt to help from now on.

Steve
System 80, not just a job, it's an adventure

This is true for all the 6 digit System 1/80 games but not for the System 80A (with the exception of Caveman) /80B games, they boot up instantly.

Steve
System 80, not just a job, it's an adventure