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First thing I can think of:
Use a multimeter or voltmeter to make sure that the head unit is indeed recieving the 12V constant from the battery. If you've done that then make sure the wire harness from the head unit is connected to the wire harness coming from the car correctly (not just matching colors cause sometimes they don't).
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"If you stop to listen to all the advice in the world, you'll end up doing nothin." -Aperson 
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