I have an NBAFB in good physical condition, with no historical errors, but recently went to turn it on and it won't boot. I looked at all the fuses and they seem to be okay, and checked all connectors, including ribbon connectors. The only lights that turn on in the game are a couple of the outer GI strings, and a couple of the backbox lights, the rest is all dead. I'm not sure where to take it from here, any ideas? Many thanks in advance!