Startup is complete when you see the utilities window After starting up from macOS Recovery or macOS Internet Recovery, select from these utilities, then click Continue:The HP software cannot access your printer during the connection setup process with a computer running Windows or macOS. Option-Command-R Start up from the recovery system over the Internet (macOS Internet Recovery). Start up from the built-in (local) recovery system on your Mac.You have to run Disk Utility to confirm the same to fix your Mac grey screen. It's time to check if your hard drive has got any problems. Repair Disk using Disk Utility.This forces the OS to write which disk is supposed to be the startup drive to the PRAM.Tip 1: Remove the App Cache from Your Mac. Select your main drive and restart. Also, open the System Preferences and click on Startup Disk. Press Command and R keys on boot, open Disk Utility and repair it if the Disk Utility shows a problem. Here’s what my MacBook Pro’s screen showed me:Open Disk Utility and verify disk. Shut down your Mac by pressing and holding the power button.Because safe boot was designed as a deterrent against Macs software problems, you are advised to enter it if your MacBook suffers any software-related.Over the last week, I encountered the dreaded Apple “prohibitory symbol” — do not enter sign or stop sign — twice: once when just booting into macOS Mojave 10.14 beta 4 and again when updating to macOS Mojave 10.14 beta 8.
Utilities For Startup Issues Update Problem WithSeveral 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. Apple says you should “try reinstalling macOS using macOS recovery.” Another Apple support page suggests that you “revert to a previous version of macOS if you experience trouble after installing an update” (using Time Machine). Please don’t go through any lengthy reinstalls or plunge down the troubleshooting rabbit hole before you hear me out. Of course, we’re talking about products like the Mac Pro, Mac mini, iMac, MacBook, MacBook Air, and MacBook Pro.When you see the prohibitory symbol, please don’t panic. But these cache files will stay on the startup disk for a long time unless you manually delete them.The is one of the symbols that users of Apple products running macOS rightfully fear. Once you complete the process, the cache files become useless. I pressed the power button to start my MacBook Pro, used the Startup Manager to select my macOS Mojave 10.14 beta 4 startup disk so an arrow appeared pointing to that bootable Mojave startup drive, clicked on the arrow, and macOS booted up perfectly. I waited at least one minute. Prohibitory symbol displayed when booting into macOS Mojave 10.14 beta 4When I saw the prohibitory symbol, I held down the power button until the Mac shut down. That’s why you should never panic. Perhaps there was a glitch while my Mac was initially looking for a bootable drive. Always be patient so that the Startup Manager has time to scan for all connected drives and display them on screen.That was easy. Select your startup disk, then click the arrow under its icon, or press Return.If you press and hold the Control key during this step, your selection is saved in Startup Disk preferences, so it persists until you change it.IMPORTANT: When you first see your bootable devices show up, you may not see all of them immediately. Release the Option key when you see the Startup Manager window.If your Mac is protected by a firmware password, you can release the key when you’re asked to enter the password. Press and hold the Option key immediately after turning on or restarting your Mac. I clicked the Update Now button (highlighted in red):3) I was prompted with an informative confirmation screen. I then clicked on Software Update… (highlighted in red):2) The Software Update window opened and informed me that “macOS Mojave Developer Beta 8” was available. The About This Mac window opened with the Overview tab highlighted. Here’s what happened:1) I initiated the update process by going to the Apple menu and selecting About This Mac. Earlier today, I decided it was time for me to be running the latest version of Mojave beta. I had been promoted several times by Mojave to update, but ignored those prompts for severals weeks. ![]() I selected the one named macOS Installer.5) Now that the arrow was pointing to macOS Installer, I clicked it to finish the probably failed or interrupted macOS update process.6) The installer showed me progress as it performed the update.7) I got the dang prohibitory symbol AGAIN.8) I pressed the power button and my MacBook Pro powered on. I used the Startup Manager as described above, holding the option key down as soon as I heard the Apple chime.3) Remember to give the Startup Manager enough time to scan for and show all your connected bootable drives.4) When it was time for me to pick a boot partition/drive, I did not select the one on which macOS Mojave 10.14 beta/public is installed. Here’s what happened and how to get around it in both cases (and again, BE PATIENT):1) After starting the installation, my MacBook Pro rebooted, showed the generic Apple progress bar, and then stopped at the prohibitory symbol.2) I pressed the power button and my MacBook Pro powered on. BE PATIENT.14) Look ma! I’m all updated to the currently latest available version of macOS, Mojave 10.14 beta 8!Prohibitory symbol displayed when updating from macOS Mojave 10.14 beta 8 to macOS Mojave 10.14 beta 11 and then to public macOS Mojave 10.14When updating from macOS Mojave 10.14 beta 8 to macOS Mojave 10.14 beta 11 and then to the public macOS Mojave 10.14, I ran into the prohibitory symbol two times during each install. In fact, the screen may go black at several points during all these steps. When the progress bar reaches the end of the estimated processing time marker, the screen may go black. With software, being patient and not panicking are virtues. Success! ConclusionHope this helps. You’ll see the progress bar and the screen may go black.12) Finally, the macOS login screen appeared on my MacBook Pro. The one named macOS Installer was NOT available.11) BE PATIENT. 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