Galaga - screen is all green - need help

GTBoom

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I recently purchased a galaxian cabinet converted into a galaga. The gentleman I purchased it from said that the game had been in his possession for the past 20 years. He thought that it was an original galaga because that was the way he purchased it. I could tell by the bezel and cabinet that he was wrong. In any case, I bought it knowing that it didn't work. He said it wouldn't power on so there was no way for me to test it. When I got it home, I plugged it in and to my surprise it actually came on but the screen is all green. I am very new to arcade repair so any help would be appreciated.

Couple of other questions not related to the monitor..
1. I paid $180. How did I do?
2. Would it be wrong to restore this as Galaga?

BTW, galaga is my grail so I was probably blinded by that little fact. It was the cheapest option for me to obtain a galaga I have seen so I jumped on it.
 

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couple of more pics ...

I do no need to replace the plug in because it is missing the ground. What problems would this cause for an arcade game?
 

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I'm guessing there is no +5vdc to the motherboard. Need to get a multimeter and test it.
Edit: I am willing to bet that if you try and coin up a game and play it you won't hear anything and the problem is not in your monitor.
 
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Thanks, I will try that when I get home tonight.

The plug is missing the ground. What problems would that cause?
 
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