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Unfortunately you can't get into diagnostics because the display board known as the "jazz board" has failed or the touchpad has failed which is why everything is unresponsive. Now if one of the "UP" button is stuck that will cause the unit to shut off and show OFF on the screen. Press and hold the down button and see if you get any response at all on either the refrigerator or freezer section. If it won't respond, then I'd replace the display board first.
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