When I first got the game I wanted to quick test it too see if it worked, It did not, I had some weird fast moving pattern on the screen but no picture and no sound.
After checking the powerboard the game did not start at all, it was completely black and all four led:s on the rom-board was lit.
I reseated all the chips that was in a socket and suddenly the game started and I was able to play, but after a reboot I got ROM error on chip 4.
So I then removed ROMs one by one and cleaned up the legs a bit, and then the game started up and is now running fine.
There are still no sound, and the monitor are way off in colours.