Quoted from CentralCACoast:
Just acquired A Firepower, having some interesting problems, I get different issues almost every time I fire it up, this is what I have seen so far on start up, display shows memory loss, try to get it in attract mode, won't go, batteries are good, sometimes LEDs flash once go out, do the switch test, lower one stays on, sometimes LEDs stay on, Sometimes LEDs flash once go out, do the switch test nothing happens, no LED. Have replaced batteries, IC's 12, 13, 16, and 19. Any help would be great, displays have shown various strange things and makes a weird sound that tapers off to silence when first fired up,
So any one of these issues can happen when you start it up? Nothing seems to consistently happen? Does it ever start without memory loss?
1) Make sure you have all the boards mounted snuggly with screws. This impacts the ground reference between boards.
2) Have you checked the ROM and chip sockets for Scanbe sockets? If you have those, you need to replace them all first thing. They are notoriously bad.
3) Have you replaced the 40 pin interboard connector? Also notoriously bad.
4) You are chasing your tail until items 2 and 3 have been completed.
EDIT: forgot to add mof's excellent suggestion - reflow or better yet - replace all the connector pins on all the boards.
If you are ordering parts, I would get electrolytic caps for the power supply board, sound board and the 100uf cap on the CPU and Driver boards.