Several Apple forums advise booting from a recovery hard drive, reinstalling macOS, repairing your hard drive with Disk Utility… These are all valid solutions… ones you should only use after trying something simple first. I was able to solve both my boot problem and update problem with simple solutions. 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 :. 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.
No entry sign on boot
I had been promoted several times by Mojave to update, but ignored those prompts for severals weeks. 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 :. 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 selected the one named macOS Installer :. Then it showed me progress as it performed the update:. The update process may take awhile. When the progress bar reaches the end of the estimated processing time marker, the screen may go black.
In fact, the screen may go black at several points during all these steps. When updating from macOS Mojave I have "got info" on an example or two of the no entry folders they seem to be the folders which come as standard in OSX I can access folders I have myself created. I then click the padlock underneatht o open it, and change both to Read and Write, click return when it asks for administrator password no password, just return. You need to be a member in order to leave a comment.
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