If the heading is your problem then all you can really do is to try another battery, as there are some less than 100% batteries in circulation, however if it isn't the battery it could be "at the simplest" a faulty internal fuse which has blown, as there at approx four internal fuses located in various parts of the circuit depending on the model, which of course you havent mentioned! The fuses by the way being miniature soldered in types.

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