The game does nothing useful at power-on: no proper boot and no game start.

Game won't start or boot because the slam circuit is open

Cause: Gottlieb's coin door slam switch is normally closed and must stay closed. An open switch, or broken or corroded wiring and connector between it and the CPU board (common after battery leaks), stops the game.

Checks

• Check the slam switch on the coin door is closed.
• Check the CPU J5 connector pins and wiring for corrosion and breaks.

Fix

• Repair the switch, wiring or connector pins.
• Consider the CPU board slam switch modification so the circuit no longer depends on the wiring.

Systems

• Gottlieb System 80
• Gottlieb System 80A
• Gottlieb System 80B

Related tips

• All displays flash "000000" at power-on: open slam circuit
• Permanently close the slam circuit on the CPU board
• System 80 switch matrix diodes
• Testing the switch matrix inputs with the test EPROM
• Game won't boot, or keeps rebooting, because of the reset board
• Dead CPU board: check the reset line first
• Displays show 000000 at once and scroll; start does nothing
• Single-ROM CPU board won't boot in an early two-PROM game

Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part One, Clay Harrell (pinrepair.com)