i turned game on to play and this is what i got.game will not start.mpu rom tested out good.has new displays and power supply.any thoughts any one.i thinking maybe the new power supply took a shit ?
I'd start with testing the voltages at the CPU board, and checking all the fuses. After that, unfortunately it's a bit broad regarding what can cause a system 6 game to not boot up.
Best resource out there, which is really an outstanding one, is pinrepair.com