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You should just be able to press the CLOCK button in the bottom right corner 1 time and then set the time if everything was working normally. It sounds like the power outage shorted the display board out so unfortunately you'll need to order and replace the entire display control board to fix this issue I'm sorry to say. The part is about $300 so below is a link to the part if you wanted to replace it.
CLICK HERE for control board
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