Neo geo only getting crosshatch

dyno

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Picke up 2 neo geo mv1 boards on ebay which both arrived today. One that I got for .99cents plus $22 for shipping was suppose to have a ram error but worked when I tried it, did get the green screen of death from it a few times when turned on so I replaced the crystal and it works great.Score:) The other boards works but I am only getting the crosshatch even when the game is in, it works fine in test mode for sound and all that but it won't read either of my games. I know it is not the cartridges because they work in my other board. What could cause this problem? Dirty card slot or bad trace?
 
Haven't cleaned the slot yet but did take the cartridge slot off my working board and put it on this board and still no game comes up, just the crosshatch screen and I can do the hardware test still.
 
The CPU can't read the program ROMs on the cartridge.

Look for a bad trace, bent pin, etc...
 
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