Nintendo vs unisystem control help

dtrasatti

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So all of a sudden, I switched out PCB's of my unisystem and now the game won't respond to the controls.

I recently had excitebike in. I swapped it out for Super Mario Bros. The game comes on fine, I can hear the sound when you pop a coin in, but when it prompts me to hit the blue start button for a 1 player game, the button won't activate the game. I can't start a 2 player game either.

What gives?
 
one of your ground wires is acting up more then likely, take off the top edge connector and make sure its clean, and put it back on, I had one where all the gound wires were running to the top pin on that edge connector and it broke off when i removed it to install another
 
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