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Friday 12 January 2018 at 01:40
Try unplugging the ribbon cables from the MPU and see if the MPU boots ok then. If it does, then reseat the ribbon cables at all board connections.
If that does not work, then measure the 5volts on the MPU at C31. If it is lower than 4.93V, then reseat J114 on the power driver board and J210 on th...
Source: http://pinside.com/pinball/forum/topic/addams-family-suddenly-wont-boot-up#post-4171267