Kawasaki Mule 4010 won’t start
 

Hi I have a 2013 Kawasaki Mule 4010 gas that was running then the DIF light came on then shut off by itself and wouldn’t run again, I replaced the stator and a spark relay, still nothing, somebody told me it’s the computer (photo attached). I bought another running mule, was running great, I wanted to make sure the computer from the first unit is bad, so I plugged it in the running unit but it didn’t run, so I plugged back the original one, and now won’t start. Please help me. Thanks