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CJfromBurgy Author

Level 1

8 points

Mac OS Big Sur upgrade

I started upgrade to Mac OS Big Sur on my iMac 27” (2019) and walked away. Now it is stuck on a totally black screen with an active cursor. Help!

Posted on Dec 12, 2020 12:16 PM

Top-ranking reply

rkaufmann87

Level 10

144,090 points

Posted on Dec 12, 2020 1:07 PM

Leave it be for another hour or so, if it does not begin to install shut it down by holding the power switch until it shuts down. Then give it a few moments and hold down the power switch for about 10-15 seconds.

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Mac OS Big Sur upgrade

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