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Question: MacBook Pro 9,2 shows circle with diagonal having accepted High Sierra upgrade

Log in problem start screen shows grey with circle and diagonal line

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Also make sure that you have your Apple ID available as when you go to download the installer again you will need you login with your Apple ID information

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Dec 12, 2017 6:20 PM in response to Boncle In response to Boncle

Hey Boncle,


If you are ever getting the prohibitory symbol at any point in most cases a OS reinstall is needed.


Boot the mac into macOS Recovery by powering on the computer and holding CMD + R to boot into recovery mode.


Once there you can select Reinstall macOS High Sierra from the menu, it should be the 2nd option.


Good Luck!

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Dec 12, 2017 5:52 AM in response to panchososa694 In response to panchososa694

Hi panchososa694, thank you for your very clear instructions.

Here are the steps I took in sequence and results:

1. Powered up my MacBook- blank screen- grey.

2. Apple logo appears.

3. Login screen with restart and shutdown options at bottom of the screen.

4. Password entered.

5. Progress Indicator appears at 3/4 completed level, progresses to 9/10 level.

6. Prohibitory Screen appears next.


What do you recommend I do next?

Dec 12, 2017 5:52 AM

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Dec 12, 2017 6:26 AM in response to Boncle In response to Boncle

From the Article that panchososa694 linked you earlier this is the section you will want to follow:


Prohibitory symbol

User uploaded file

When you see a circle with a slash symbol instead of the Apple logo, it means your Mac couldn't find a valid System Folder to start up from.

If you're using your Mac at a school or business, it might be trying to start from the wrong version of macOS. Contact your IT department for more help.

If this is your personal Mac, try reinstalling macOS using macOS recovery. (specifically this as your system will need a reinstall of High Sierra)

Dec 12, 2017 6:26 AM

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Question marked as Helpful

Dec 12, 2017 6:20 PM in response to Boncle In response to Boncle

Hey Boncle,


If you are ever getting the prohibitory symbol at any point in most cases a OS reinstall is needed.


Boot the mac into macOS Recovery by powering on the computer and holding CMD + R to boot into recovery mode.


Once there you can select Reinstall macOS High Sierra from the menu, it should be the 2nd option.


Good Luck!

Dec 12, 2017 6:20 PM

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User profile for user: Boncle

Question: MacBook Pro 9,2 shows circle with diagonal having accepted High Sierra upgrade