Gotta bring this thread back unfortunately. I have a swemmer sys80 board in my Excalibur that's about a year old. It suddenly stopped booting yesterday. No displays, nothing but gi. I have a rottendog driver board in it and it is supplying the 5volts. All leds on the Swemmer are green except for Led18, but I don't know if that's always been that way.
I tried reseating the roms, all connectors/connections are solid, I tried removing the nvram. Nothing.
Any ideas would be greatly appreciated!