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Q: iMac (Retina 5K, 27-inch, 2015) shows a grey screen with "Stop" sinal

My iMac after freezing, I restarted it but after the initial boot (showing the apple) it freezes and shows a grey screen with the stop sign.

MY understanding is that this is caused by some issue on one  the booth files. My iMac doesn't have any CD and the keyboard is wireless.

There  anything I can do to fix it?

Posted on May 7, 2016 2:50 PM

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Q: iMac (Retina 5K, 27-inch, 2015) shows a grey screen with "Stop" sinal

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