If someone turned off the power in the midst of the start sequence, it could be as simple as the score motor having stopped in between the designed rest positions. Before spending time testing the start sequence, reach inside the main cabinet and give the score motor a spin (with the game turned on) and see if that solves the issue.

Lee

Ok, so there are credits showing in the credit window of the backglass and pressing the start button does nothing at all (does not decrement a credit)?

If so, there are a number of switches that need to be closed (conducting) for the start button to energize the coils for the start relay (S) and the "subtract replay unit".

There is the zero-position switch on the credit unit itself, a normally closed (NC) switch on the hold relay (R), an NC switch on the 2nd chute relay (W), an NC switch at motor position 1C (has an orange and a maroon/green wire on the tab ends), an NC switch at motor position 2B (has maroon/green and slate colored wires), and an NC anti-cheat switch (I have no idea where that is located).

I suggest starting with the first switch and inspecting each to see if they are conducting. Sometimes, these switches will be appear to be making contact, but are still not conducting. Sometimes it helps to put a micro-alligator clip to hold the contacts closed while troubleshooting.

Lee