My iMac's Big Sur installation was interrupted, and now it won't start

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Level 1

8 points

My iMac's Big Sur installation was interrupted, and now it won't start

I think the power blinked off. Have tried restarting several times. It'd get 3/4 of the way there, on the progress bar, and blink off. That's happened a few times. Now it's holding, which is different. Said 22min, now 28. I have a bad feeling the time will keep increasing. Help!!! I'm supposed to be working.

iMac 27″ 5K, macOS 10.14

Posted on Aug 7, 2021 9:19 AM

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Answer 1

Top-ranking reply

Jack-19

Level 8

46,008 points

Aug 7, 2021 10:11 AM in response to Boodiba

Welcome to the Apple Support Communities.

Try to follow these steps:

Shut off the Mac.
Turn on the Mac, and immediately press and hold Option + Command + R until you see a spinning globe.
Once you are in macOS Recovery, verify you are connected to WiFi in the top right corner. If possible, connect directly to the internet with Ethernet.
Go to the reinstall macOS app.
Follow the prompts, and install on Macintosh HD.

Jack

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Answer 2

Kshot77

Level 1

4 points

Aug 12, 2021 5:00 PM in response to Jack-19

I’ve made it into recovery mode but am unable to select Reinstall MacOS Big Sur because neither my mouse nor keyboard are registering any input on screen. I was able to use my keyboard arrows to select my network and enter its password.

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Answer 3

Boodiba Author

Level 1

8 points

Aug 8, 2021 4:45 PM in response to Jack-19

Thanks Jack! I actually didn't have to do anything else. It did finally complete an install, after the 3rd reboot and about an hour's wait.

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My iMac's Big Sur installation was interrupted, and now it won't start

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