my 2003 S430 radio/navigater is not working. on 2003 Mercedes-Benz S430

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My 2003 S430 the radio is not working,when I press the power on it tells me "Sound Unavailable" and then shots off by it self.
(1) Answer
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suggest having a local auto radio repair shop pull the unit. they may be able to repair it or know of somewhere
that can repair it.