91 560SEL, radio just stopped working, it will not turn on any longer. When trying to turn it on, all you hear is clicking noise from the head unit and slight pop noises from the speakers. I check all the fuses including the one behind the radio & they are ok. I check all wiring behind the radio which is ok as well. Any tips? This problem happened out of nowhere. I would also like to point out that I have has the RR shelf speaker disconnected because it was blown

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2001 E55

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2006 SLK280

2016 Subaru Outback 3.6