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Question: I updated my mac Os and now it is showing prohibitory sign. what to do?

I was updating my Os in macbook pro and now it is showing prohibitory sign when the mac is on after entering password and loading for a small time. My macbook model is MD101HN/A and model number is A1278.

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Dec 9, 2017 6:46 AM in response to Chackofrancis In response to Chackofrancis

As per this article About the screens you see when your Mac starts up - Apple Support

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.

Dec 9, 2017 6:46 AM

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Dec 9, 2017 10:07 AM in response to Kappy In response to Kappy

Kappy wrote:


And where would that be? Such an unhelpful remark. Why did you even post it?

Did you test the links posted?


The first goes to a description of all the symbols you can see and is titled, "About the screens you see when your Mac starts up," not the original article you think you are linking to which described a lot more about the problem. However, the current article does offer a small amount of help.

The second one just goes to the Apple Support site because it cannot find the article you tried to link (as it doesn't seem to exist anymore).


I'll not bother trying to help you update your boilerplate responses in the future.

Dec 9, 2017 10:07 AM

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Dec 9, 2017 10:16 AM in response to Barney-15E In response to Barney-15E

Have you ever installed any third-party software that purports to clean, protect, optimize, or otherwise maintain your Mac? That's predominately the cause of problems on macOS.

Proof, please. Some software cause problems, but such software isn't predominantly the cause. Do you know what the predominant cause is?


Dec 9, 2017 10:16 AM

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User profile for user: Chackofrancis

Question: I updated my mac Os and now it is showing prohibitory sign. what to do?