Multi Color dashed lines on my DK machine

diecasthft

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Myersville, Maryland
Good Evening All!! I wanted to ask a question, and I'm very new to all of this...but I bought a Donkey Kong Caberet machine at an auction for 35 dollars...and it didn't work. I sent the video board away, and had it rebuilt. I worked for a few days pretty good, but now it has developed a problem on the monitor. It has several dahsed colored lines running horizontally...they come and go. Sometimes it almost fills the whole screen..other times it's very scattered. Can anyone tell me what may be causing this??
 
Added picture

I added a picture of what's going on with my DK machine. It's funny that it doesn't always have the lines on the monitor. I think I'm going to throw another monitor on it to see if it's a monitor issue, or something else.
 
gregatron has the right idea but if that dosen't help pull & clean anything in a socket
 
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