What I have is a dedicated 4 slot Neo Cab. It's in the original neo-geo cabinet and I have not messed with the wires or connections. If the machine stays on for a while it will sometimes go to a black screen and say Z80 error. Now I have seen it said that this is some kind of sound problem and could mean you have blown your sound processor. My sound works though right up until I get this screen. When I restart the machine the sound works and everything is cool again. Then after a while it goes black and gives me that error. Any ideas?