HT204156: About the screens you see when your Mac starts up
Learn about About the screens you see when your Mac starts up
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Oct 16, 2016 8:41 AM in response to Petralkaprby Eric Root,Try booting into Internet Recovery (command - option/alt - R on a restart). It is a slow process. This will install the OS that the computer shipped with. You can then try to upgrade from there.