I just picked uop a Gottlieb/Premier 1989 Hot Shots Sys 80B machine.
I played several games after getting it set-up. Came in the next day, to remove the mylar which was lifting the inserts. cleaned everything up, reset the inserts, cleaned again. Played two games, shut it down.
Came in next morning, turned the machine on, booted fine, went into attached, I added credits, hit start and the game immediately gave a long beep and went back into attract mode. Tried again same issue. Turned the machine off, this time the display was garbage and when I went to add a credit it beeped again and went back into attract (voice came on at the interval). Shut it down again, check connectors etc, turned it back on, the machine beeps for 1-2 seconds waits 5 seconds and beeps again. The attract lights are working and the alpha display is working. I turned it off and left it.
I am assuming it is connector issues or power supply but wanted to gather some advice before proceeding.