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KCNottm Author

Level 1

8 points

Not coming out of Sleep mode

I updated to Catalina a couple of months ago. I normally leave the iMac in ‘Sleep’ mode when not using it.

Since updating, I’ve had two occasions where the iMac has not come back to life out of Sleep - the screen stays black. On one of those occasions it partly woke up, but was asking me to enter passwords for various features on ‘Keychain’ which I’ve never used.

On both occasions I solved the problem by switching off at the mains, disconnecting, then re-starting and signing in again.

It’s obviously a fault that’s come with Catalina; any suggestions ?

Posted on Aug 11, 2020 6:14 AM

Top-ranking reply

leroydouglas

Community+ 2024

Level 10

188,454 points

Posted on Aug 11, 2020 6:32 AM

KCNottm wrote:

I updated to Catalina a couple of months ago. I normally leave the iMac in ‘Sleep’ mode when not using it.

Since updating, I’ve had two occasions where the iMac has not come back to life out of Sleep - the screen stays black. On one of those occasions it partly woke up, but was asking me to enter passwords for various features on ‘Keychain’ which I’ve never used.

On both occasions I solved the problem by switching off at the mains, disconnecting, then re-starting and signing in again.

It’s obviously a fault that’s come with Catalina; any suggestions ?

Try resetting the SMC https://support.apple.com/en-us/HT201295

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Not coming out of Sleep mode

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