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Be respectful, keep it civil and stay on topic. We delete comments that violate our policy , which we encourage you to read. Discussion threads can be closed at any time at our discretion. Don't show this again. Computers Resolve boot issues showing 'prohibitory' sign Mac OS X has several bootup symbols, including a universal "prohibitory" sign that indicates critical files are missing from the boot volume. This symbol at boot means Mac OS X cannot access critical files on the start-up disk. When I saw the prohibitory symbol, I held down the power button until the Mac shut down.
I waited at least one minute.
You should use the Startup Manager as described here:. When you first see your bootable devices show up, you may not see all of them immediately. Always be patient so that the Startup Manager has time to scan for all connected drives and display them on screen. That was easy.
Perhaps there was a glitch while my Mac was initially looking for a bootable drive. These things happen. I had heard that Apple had released versions of Mojave newer than the one I initially installed. I had been promoted several times by Mojave to update, but ignored those prompts for severals weeks.
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Earlier today, I decided it was time for me to be running the latest version of Mojave beta. The About This Mac window opened with the Overview tab highlighted. I then clicked on Software Update… highlighted in red:. I clicked the Update Now button highlighted in red:.
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I clicked the Install Now button highlighted in red:. I pressed the power button until my MacBook Pro powered down. I used the Startup Manager as described above and at the link , holding the option key down as soon as I heard the Apple chime. I fixed it easily by following these steps. Stamos Stamos 2.
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