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So you could have 1 of 2 problems. Either your start button on the touchpad has failed and the entire touchpad needs to be replaced, or the door latch switch doesn't think the door is shut and you need a new door latch switch. It's very easy to determine which is your problem. Just turn the dishwasher off so no lights are on at all. Next, press the start button and does the control panel light up? If not, then the touchpad doesn't recognize that you are pushing a button and the touchpad needs to be replaced because the start button has failed. If the touchpad does light up when pressing the start button, then you need to replace the door latch switch.
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I'm sorry you don't want to believe my answer, but if everything was good because it's a "brand new dishwasher", then it would obviously be running---which it's not. Good luck to you.