Model NA7LX NORCOLD REFRIGERATOR shut down after power interruption. When I am able to view power up display, I see all choices for ac, dc & lp & auto. However when selecting for choice, screen goes blank. I am sensing a communication fault with the. mother board. Sometimes as I hold down the mode button a long time, it will begin selecting numbers each time I touch it. After it passes 9, it then goes back to display auto, dc, ac, lp. All of the fuses are ok. the board shows no presence of heat. Not sure how to reset board or if that will allow restart.