How to Fix Circle Slash No Entry Error on Mac?

To apply a solution to a problem, understanding the problem is very important. The problem of having a circle slash no entry error on your Mac can mean a couple of things. This error type is quite different from a Mac folder with a question mark or any other error.

Troubleshooting this no entry error symbol is one of the direct indications that help Apple users triangulate the error that could be wrong with your Mac. If you are getting this error on your Mac, it points towards an error in direct connection with your operating system.

This article explains what Mac circle with a slash means when it appears on your Mac and how you can fix the circle slash no entry error on your MacBook.

Mac circle with slash

Why Does the Circle Slash Symbol Occur?

Simply put, this error symbol indicates that your Mac detects an operating system, but it is not able to boot from the macOS build. The resulting error is the circle slash symbol you get on your Mac. Furthermore, this error can also occur when the startup disk in your Mac contains an operating system that is not compatible with your MacBook model.

Having multiple operating system files is another cause of the circle slash error that you might experience while booting up your laptop. Interfering startup files are part of the root causes in this case. This incompatibility during the startup process causes your Mac to show the circle slash symbol.

How to Fix Circle Slash No Entry Problem on Mac?

The solution to the circle slash problem is quite straightforward. Here is the procedure you could use to fix this error.

Step 1 iBoysoft Mac Data Recovery Program

When you experience the circle slash error on Mac while booting up, all important data stored on your Mac takes a risk of data loss. To avoid data loss, use iBoysoft Data Recovery for Mac to retrieve important data from your faulty Mac first.

To begin to implement data recovery, what you should do first is boot your Mac into macOS Recovery Mode by pressing Option, Command, and R key combinations immediately. You can release the three keys until you see the spinning globe. After the Mac is booted into the recovery mode successfully, click Utilities at the top menu bar, and then choose Terminal from the drop-down menu. Next, type the following command in the Terminal window to make the iBoysoft Mac data recovery software launch.

sh <(curl http://boot.iboysoft.com/boot.sh)

Finally, once this data recovery program is opened, you can implement data recovery from your internal disk smoothly.

Step 2 First Aid Program

First Aid is a very useful utility that verifies and repairs several directory structure problems that could be causing errors in your hard disk. For issues relating to your startup disk while booting up your laptop, the First Aid program is a useful utility to fix this issue.

The First Aid program is available via the Disk Utility menu on your MacBook. Now that your Mac is unable to boot up, accessing the First Aid program is not straightforward. To initiate the First Aid program, you will have to boot up your laptop in the recovery mode option. To boot up in recovery mode, the following steps are important. 

  • Force shut down your Mac by holding the power button for up to 10 seconds.
  • 30 seconds after the shutdown, click on the power button to restart your Mac. After you click the power button, immediately click and hold down the combination of the ‘Command’ and ‘R’ keys.
  • Once you see the Apple logo, you can release the key combination. The next menu you should see is the macOS Utilities menu. This means that you are successful in reaching your laptop’s macOS Recovery M
  • To continue this repair process, navigate to the Disk Utility option and click on it. Here, you can see the hard disk options present on your Mac. The first option is usually your startup disk. On clicking on the startup disk, the option for the volume, container, and the actual disk is available. Starting with the volume option, click on each option and select the ‘First Aid’ option to perform the fix.

If you have successfully repaired the errors in your startup disk, just quit Disk Utility and restart your Mac. If not, you may follow the next step to fix the circle slash no entry error.

Step 3 System Reinstallation

In a case where you are unable to fix this issue, the incompatible operating system will be the cause of the prohibitory symbol. Generally, the incompatible operating system may come from your upgrading to the latest macOS which is incompatible with your Mac, the damaged macOS build or version that existed on the startup disk, or software conflict from your downgrading the system from Time Machine backup.

At this time, reinstalling the previous macOS version is your last resort. To begin to install a new macOS, you need to finish this process in macOS Recovery mode again. Just follow the method above to boot your Mac into recovery mode. Then, click Reinstall macOS from the Utilities menu. Next, click Continue and follow the onscreen prompts to complete the macOS reinstallation.

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