I'm by far no EM guy. However, I bought 3 Bingo machines to cut my teeth into the EM world.. First thing I learned is switch cleaning, switch cleaning, switch cleaning... After a lot of tail chasing on the first machine I figured out most of my issues were dirty switches. I simply decided the easiest way to troubleshoot is clean all the switches before even attempting to troubleshoot.

First machine took me 4 days to get running.... The next two machines were simply cleaning all the switches before thinking about powering them on.. After doing this, both machines fired up with relative ease...

I used a business card and fine grit sandpaper and slid it between the contacts to clean them....