NVRAM to get rid of batteries forever!! Easy swap out on this game since the old RAM is in an IC socket already. https://www.pinitech.com/products/6264_nvram.php

Post a picture of the boards with the game turned on. That will help us a lot too.

Be sure the coin door is in the closed position when turning on the game. Certain games will allow you to open the door at that time (once power is on) and close it so it will go into the attract mode. I can't recall if certain DE games will allow this, but some Stern Whitestar games do.

Show off your DMD now you have it working.

First off on the sound, post a picture of the sound board with the wiring connected and the top half of the CPU board with the wiring connected.