Data East WWF Royal Rumble (Data East, 1994) Display is out, even tried brand new dmd

[celiac]

the old dmd was working fine aside from gassing out, so my wife got me the cheap 139.00 replacment DMD from PBL . I replaced the gassy one with the new one and it did not work, I thought it was a bad DMD so I tried it in my HS II and it powered up. So I put the gassy dmd back in the WWF and it does not work either. I wish I would have turned on WWF before trying the new one to see if it was working but now I know.
I checked fuses and tested voltage and everything is how it should be.
What am I missing and how do I find out whats going on with it?

 

[spalmer]

Could you have damaged a connector or cable in the swap? Try pull the ribbon cable out of High Speed II and putting it in WWF.