Why did you have to replace the mainboard?
Was there some electrical surge, or a lightning strike? Because if your first mainboard was destroyed, it may have taken the LCD expansion board with it...
You can't do much wrong with the UM2 EXP connectors: it's impossible to connect them wrong (reverse polarity), and confusing EXP1 with EXP2 "should" only make it not work, but not damage anything.
Of course there's always the possibility that your flat ribbon cables are broken. If you have a multimeter, try checking the cables for bad connections.
Or you can just take a close look at them and see if everything seems ok.
Chances for bad cables are usually pretty low, especially if the wires are never moved around or excessively bent.
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naz72 0
One more thing I forgot to add:
I also tried disconnecting all the cables from my extruder and also the heated bed incase that was causing a short circuit but still no luck.
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