Whirlpool dishwasher having issues, what would cause these symptoms?

I have a Whirlpool dishwasher (type 575-0). Over the weekend, the dishwasher control buttons simply stopped working. No LEDs came on when the button was pushed, dishwasher didn’t start, nothing.

Yesterday I disassembled the dishwasher, reset all the connections, and clean up the door switch. After reassembling the dishwasher and turning power back on, exactly one light came on (the sani-rinse). Thinking it was just the lights, I pushed start and when I closed the door, there was a mechanical grinding sound. I don’t think it was the integrated disposal, it sounded more like a pump or valve. It definitely didn’t sound good. After that happened, the board was once more dead. After resetting the power, again the single light. I tried putting it into diagnostic mode, but nothing happened.

Does this seem like a control board issue? With the odd sound, I’m wondering if one of the pumps/values is causing a problem that breaks the controls. The control board costs 1/3 of the amount of a new dishwasher, so I’m not going to replace it unless I know that is the problem.

Does anyone have any ideas on what the issue could be?