![]() Or, you may want to contact Apple support for help. Hopefully, you'll get rid of this prohibitory symbol when Mac is booting up.īut if the startup disk is not detected in Disk Utility or by the macOS reinstallation wizard, it means your hard drive has failed and needs to be replaced. So, compatibility checking of the macOS and Mac models before upgrading is necessary.Īfter trying the fixing guide in this passage, you can restart your Mac or M1 Mac to see whether the annoying sign of a circle with a line through it has disappeared or not. Some try to downgrade macOS Big Sur to an older system with Time Machine backup, only to find that the crossed-out circle at Mac startup due to incompatible OS. The □ 'Prohibitory sign' is one of the multiple scenarios you will encounter when your Macbook won't turn on after an update. LINE is a Climate Neutral certified brand and offsets 100 of its carbon. And then feedback it with a crossed-out circle at startup. LINEDOCK is an all-in-one MacBook Pro power dock that offers extra charge. ![]() To make it straightforward, Mac does detect an operating system in the startup disk, but it can't boot from that macOS version or build. What does a circle with a line through it mean at Mac startup?ĭifferent from the "Mac folder with a question mark" issue, a circle with a line or slash through it means that your selected startup disk has a Mac operating system that can't be used by your Mac model. If First Aid fails to repair the startup disk, then it should be the incompatible Mac operating system that causes the prohibitory symbol on Mac boot. ![]() Step 3: Back up files from the Mac and reinstall macOS If First Aid found no errors and your Mac still starts up with a circle and a line through it, continue with the next movement. If First Aid succeeds in repairing the errors in the startup disk, you can quit Disk Utility and reboot your Mac as normal. So, when your Mac won't boot past the sign of crossed-out circle, simply check, verify, and repair the startup disk with Disk Utility First Aid in macOS Recovery mode. You may also see the circle with a line through it on your Mac if the Macintosh HD is corrupted.įirst Aid in Disk Utility can find and repair errors that lead to Mac's unexpected behaviors that prevent your Mac from turning on. Step 2: Repair the startup disk with Disk Utility These combinations work both in Excel for Mac 2011 and the new Excel for Mac 2015. As an alternative, Control + Command + Enter can also be used to achieve the same. Note: If you can't boot into macOS Recovery mode by the guide above, you can replace the key combinations with Option + Command + R (or Shift+ Option + Command + R), and keep your Mac connecting to the Internet. The answer is to use Control + Option + Enter, which will create a line break in the cell.
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