It sounds like a bad control board or timer assembly.
As a general rule, if there is a problem with an interlock switch on the door or flood switch, the unit won't even start.
Try turning the power off to the dishwasher, wait a few minutes and turn it back on, then try again. If no luck, the board/timer sounds like the problem.
These parts are replaceable, but if the dishwasher is over 10-12 years old, it not be worth the repairs. Get estimates first.
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