Jenn-air dishwasher not draining and not starting

I noticed a recently that the dishwasher didn’t drain after the cycle a few times and left water in the bottom of the tub. Now it won’t start at all. How do I troubleshoot if its the door switch, control panel or another issue.all the lights on the controls light up correctly.
I am pretty handy and have any tool needed. Thanks for any guidance.