Hi, I own a set of initial d 3 arcade machines and when I set the game assignment settings for the main machine to seat 1 it just shows a black screen on after loading the default screen. I tried to unplug the optic cables because i believe that this is how they communicate, and still I get the same problem. When I set the main machine to seat 1 and the second machine to seat 2 and boot them both with the optic cable plugged in, the main machine still gives me the black screen and the send machine just says checking network now. It's been months now and I haven't been able to play my any of my friends. Any help would be greatly appreciated. P.S. i looked in all the manuals and can't seem to find a solution to my problem. Is there a way I can test to see if the cable are bad??

- Thanks!