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I updated my mac Os and now it is showing prohibitory sign. what to do?

I was updating my Os in macbook pro and now it is showing prohibitory sign when the mac is on after entering password and loading for a small time. My macbook model is MD101HN/A and model number is A1278.

Posted on Dec 8, 2017 7:26 PM

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I updated my mac Os and now it is showing prohibitory sign. what to do?

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