My best guess is that the ROM or one of the other chips was not installed completely.
Note the orientation of each chip. Notch should be oriented as shown in the silkscreen.
A ROM inserted backwards and powered on will destroy the ROM.
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Chris Hibler - CARGPB #31
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Settings: Have you installed NVRAM? Or, are you using a battery backup?
DMD: We'll need to see a video of the behavior to be of much help.

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Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact
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Interesting.
Can you post a video of display test running?
NGG is a WPC-95 game. The "DMD Controller" has been integrated onto the A/V board.
I'd try a different DMD panel first to see if the problem remains.
Then I'd try a different AV board to see if the problem remains.
I know that most people don't have an extra AV board laying around but if you have two WPC95 games, you can try that. You don't need to swap ROMs. No damage can be done by doing this.
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Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact
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Interesting.
I've never seen that.
I think I would focus on the 3 skinny DIP RAM chips (usually Cypress branded).
That AV board is not trivial to work on.
If you don't have significant PCB repair experience and the right tools, send it to your favorite board repair guy.
--
Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact
https://www.youtube.com/c/ChrisHiblerPinball
http://www.PinWiki.com - The Place to go for Pinball Repair Info