I just purchased a Gottlieb Shaq Attaq and when turning on there was a lot of garbage on the screen. I did some quick research and found out that the R3 pot on the A2 power supply could be the culprit. I adjusted the pot and the game came on properly. I decided to purchase the A2 power supply and when i inserted it - I still get the same problem. When I adjust the pot, it works properly but when I turn off the machine and turn on again - the problems exists again. Any ideas where to look next.