What Does a Prohibitory Symbol Mean on Mac?

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Prohibitory Symbol

MacBook is one of the usual go-to laptops because of its optimal performance, durability and usability. Several people prefer to stick with this laptop option for different reasons. One of such is the ability to streamline defects and get fixes to these defects.

When it comes to booting up your MacBook, several symbols let you know if you are doing the right thing or the wrong thing. One of such is the Mac prohibitory symbol that you get when you boot up your laptop and something is wrong.

What Is This Prohibitory Symbol And What Does It Mean?

In the majority of the cases, this prohibition symbol appears when your MacBook is not seeing the right operating system in the startup disk. This prohibitory symbol also means that the system has found a bootable operating system on the startup disk but there is something wrong with it. It could be that the operating system is not compatible with your current MacBook model. It could also mean that there are missing critical component necessary for the operating system during booting up.

Statistically, people with multiple operating systems are the ones who are prone to having this prohibitory symbol pop up while starting their Mac. This is due to the modification of the operating system files that the Mac usually run on. This, in effect, affects the MacBook on the next restart process.

Another major cause of this prohibitory symbol while booting up your Mac is disk failure. In this scenario, the boot disk containing the booting files is not unstable or corrupt. Although this is a very rare occurrence. It may result in the prohibitory symbol while booting up your Mac.

For the different scenarios, there are different methods of fixing them. In the case where the system file for booting up has some modification, you might have to reinstall the closest version of the macOS that you originally work with on your Mac.

How to Fix The Prohibitory Symbol On Your Mac?

To fix this error, here are some potential fixes you can apply to your Mac.

  1. Reset the PRAM

This method hopes to restart all the process with the hope that the system will reboot properly. Sometimes, your Mac might have one or two processes that are not up and running. These processes might be essential for booting your Mac. Force resetting the PRAM might help resolve that issue.

To proceed with this method, press and hold the ‘Command’, ‘Option’, ‘P’ and ‘R’ key immediately after you click the power button to start your Mac. The combination of these keys will continually make your system reset while you hold down those keys. After a few cycle of reboots, you can release these keys and hold your Mac restarts.

  1. Perform Startup Disk Repair

Another way to fix this issue is by performing a disk repair. Using the Disk Utility option in your recovery mode is the perfect way to repair your startup disk. To boot into recovery mode, click and hold down the ‘Command’ and ‘R’ keys immediately after clicking the power button. Hold down this key combination for five seconds or a little bit more until you see the recovery mode option. Scroll to ‘Disk Utility’ to initiate the disk repair process.

From the disk option, you can see the different disk volume of your Mac. The first disk in this option should be your startup disk that contains the startup files for your laptop. For each of the disks you wish to repair, start with repairing the last volume on the disk. Click on the volume and then select the ‘First Aid’ option. Next, select the container and the disk to perform similar operations on them.

If Disk Utility is not fixing the error on your disk, you should consider erasing your disk of its data and return it to its factory settings.

  1. Reinstall the Previous macOS Version

The problem causing this prohibitory symbol might be because of the new operating system configuration you are trying to use. Returning to the previous macOS version that is compatible with your Mac might be the best option for you.

To do this, you could use your Time Machine backup to restore the working version of your Mac. Another option is to consider using a Target Disk Mode to reinstall the previous macOS version to your Mac. Although the macOS reinstallation can help you to fix the prohibitory symbol issue, it may cause data loss. Thus, back up your files before the reinstallation starts. If you forget to do so, you can use iBoysoft Data Recovery for Mac to offer you help.

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