Thanks for replying.
That's weird. Because the video as shown here: https://www.youtube.com/watch?v=XqLCqCMDoeg&t=4s is outputting this boot screen on the original PCB. Correct me if I am wrong.
I am running the System 11/12 games on MAME. I am not using the original PCB, and therefore are not using the Jamma edge connector or JVS inputs. Sorry if that was not clear.
As for the monitor connected to the PC, I am not sure about the amount of khz it is utilising. Do you know how to verify this?