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Question: Install MacOS on a usb bymistake

Hello,

I install MacOS High Sierra on USB drive instead of updating it through app store. Now my MacBook only starts when I connect this USB. I want to install it back to how it was without deleting any data and with the exact same settings how it was. What can I do?

MacBook, iOS 11.2

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Dec 13, 2017 11:51 AM in response to angrajfrommumbai In response to angrajfrommumbai

Hello angrajfrommumbai,

Thanks for reaching out to the Apple Support Communities. I understand you're running into some trouble Starting up your iMac from your hard drive, and I have some information that may help.

Have a look at the article below for some helpful troubleshooting steps.

How to choose a startup disk on your Mac - Apple Support
If the trouble persists, you may need to reinstall the Mac OS to your hard drive using the steps below.

How to reinstall macOS - Apple Support


If you run into any trouble, or if the symptoms persist, please reach out again.
​Best Regards.

Dec 13, 2017 11:51 AM

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Question: Install MacOS on a usb bymistake