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Question: After downloading High Sierra os, error message appeared during installation. when revooting, flashing folder graphic with a question mark appeared. Can’t reboot. Help.

Trouble installing High Sierra

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Nov 20, 2017 1:58 PM in response to SGTD In response to SGTD

Hello, SGTD.

Welcome to Apple Support Communities.

It's my understanding that after downloading macOS High Sierra, you're now getting the question mark folder on your screen. I may be able to help with this. Check out this article: About the screens you see when your Mac starts up

Other screens you might see

You might see one of these screens appear during startup if you've changed your startup options, or if there's an issue starting up your Mac.

Folder with a question mark

User uploaded file

If you see a folder with a question mark appear instead of the Apple logo, it means your Mac couldn't find a local or network-based startup disk. This can happen if the disk selected in the Startup Disk pane of System Preferences isn't available. Wait a few seconds to see if your Mac is able to locate the startup disk you specified.

If you still see a question mark after waiting a few seconds, use Startup Manager to start up your Mac, then select your startup disk from System Preferences.

If a question mark appears after you install a software update, select your startup disk again using macOS Recovery.

Let me know if this helps.

Thank you for using Apple Support Communities.

Cheers!

Nov 20, 2017 1:58 PM

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Question: After downloading High Sierra os, error message appeared during installation. when revooting, flashing folder graphic with a question mark appeared. Can’t reboot. Help.