Pedro Coelho, first make sure that you check your dock connector to see if there are any broken, bend or otherwise damaged pins. After that you may have to take it apart and see if there is any obvious damage or dislodged parts. Could be as simple as a dislodged cable/connector or a bad battery, to as complicated as a broken logic board.Right now it would only be hypothetical and a guess about what could be the problem. Of course, you should also try a hard reset.
Hold the sleep/wake button and the home button at the same time.
Hold them both until the screen goes black.
Hold them until the white Apple logo appears then you can let go.
Hope this helps, good luck.
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