Quoted from iluvak9:
I had the game in lamp test mode with all lights flashing and was reviewing the manual to find the wire and connector that ran the light that was not working. Was about five feet from the machine when I heard a strange noise and saw lamps were no longer flashing and game had frozen with just GI lights on. Turned the game off and on again and saw that the MPU flashes stopped after four or five. Since I was not near the game, I don’t think I did anything to cause this to happen. I will contact the person I bought the board from. I also have a backup original MPU and I am going to put that in the game this weekend or sooner. If that corrects the startup problem then it seems like that would confirm the new MPU board that I bought was the problem.
Check the +43 volt on the power supply board in the cabinet, I believe you will find fuse F-4 blown a 5 amp fuse. It may be a coil somewhere on the playfield or the coin door. Check your coil resistance on all playfield coils and coin door. I believe you will find a short on one of them. Anything less than 2.5ohms is a bad coil.