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When I plug in my MH721 cutter and turn it on the only thing it does is all the lights blink the display blinks and the thing that holds the blade jumps up and down. please help brand new at this . :help:

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Welcome to our forums!!

Is this a new unit, right out of the box, or has it worked before?

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that is a bad motherboard.  What you are describing is exactly what mine did when it went bad.  It

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