What do you do? First, check the circuit for mechanical failures, like non-connected wires, broken vias on the board (these are holes on the printed circuit board that have a metal coating down the length of the hole to connect one side of the board to the other), bad battery contacts inside the case, broken pins on a component, cold solder joints, etc. Even worse, it refuses to give any signs of life. So you've put a circuit together and as far as you know everything appears to be ok, but it doesn't work as expected.
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