If you have 12v going into the head unit from ignition key circuit than the head unit should turn on. Does it turn on? If not did you check that there was 12v on the yellow wire coming in (usually yellow) to the back harness of radio. (OEM drawings are available online)? If you have power there and unit won't power up then you likely have a bad head unit. Depending on model it can be cheap and easy or more hard and expensive.
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