Hello and welcome to Android Forums. Hopefully I can help you with your problem.
Either something is not connected properly or you have hardware damage. Recheck and make sure it is hooked up correctly. If you still cannot get it working then I recommend taking into a shop and having them check it out.
If you have any other questions regarding your device, I invite you to join Android Forums. We have many sections for specific devices which contain a wealth of information.
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