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divergent1 Author

Level 1

4 points

Black screen after upgrading Big Sur on iMac 27“

After upgrading my iMac with Big Sur the screen remains black and seems to be frozen. What can I do to restart my iMac?

Posted on Aug 18, 2021 5:53 AM

Top-ranking reply

rkaufmann87

Level 10

144,844 points

Posted on Aug 18, 2021 7:45 AM

You may have suffered a hardware failure when the upgrade occurred. Please try shutting down the computer and then restart and hold down the power button for about 15-20 seconds. If it still will not start up, please take the computer to your local Apple Authorized Service Provider to be serviced.

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Black screen after upgrading Big Sur on iMac 27“

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