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I hesitated and hesitated to do the Catalina upgrade and finally did a few weeks ago. Since then, when my computer goes to sleep mode, the screen goes bright blue and stays this way. I see there there were several posts about this same issue back in 2019, without resolution. There has to be a fix to this by now?? I have a 2017 iMac.
iMac 27″ 5K, macOS 10.15
Usually the problem with Sleep Mode not working properly is macOS running into a problem with an app not behaving properly in response to the sleep process.
The best way to narrow things down is to create a new fresh "test" user account, restart your iMac and log directly into that account instead of your normal <user name> account and to see if that works properly. If that works fine then it's a matter of what app or software loading automatically in the background of your normal <user name> account is the issue. If the problem still happens on a fresh "test" user account though, then that means it's something not-related to the software on your specific user account that would need further troubleshooting for something lower level.
If you've never had to create a new user account and don't know how, this page explains how easy it is:
https://support.apple.com/guide/mac-help/set-up-other-users-on-your-mac-mtusr001/mac
Also, when you create the new "test" user and restart your iMac to test it, don't bother to sign into your Apple ID as part of the new user account. You can skip that/indicate you don't have an Apple ID/and don't want to create one, just so you can log into that new user account and not have it sync with your Apple ID data.
Usually the problem with Sleep Mode not working properly is macOS running into a problem with an app not behaving properly in response to the sleep process.
The best way to narrow things down is to create a new fresh "test" user account, restart your iMac and log directly into that account instead of your normal <user name> account and to see if that works properly. If that works fine then it's a matter of what app or software loading automatically in the background of your normal <user name> account is the issue. If the problem still happens on a fresh "test" user account though, then that means it's something not-related to the software on your specific user account that would need further troubleshooting for something lower level.
If you've never had to create a new user account and don't know how, this page explains how easy it is:
https://support.apple.com/guide/mac-help/set-up-other-users-on-your-mac-mtusr001/mac
Also, when you create the new "test" user and restart your iMac to test it, don't bother to sign into your Apple ID as part of the new user account. You can skip that/indicate you don't have an Apple ID/and don't want to create one, just so you can log into that new user account and not have it sync with your Apple ID data.
You can save you and us a lot of time and effort if you do the following:
Please navigate to the Mac App Store or navigate to www.Etrecheck.com and download the free version of EtreCheck. Once you have you downloaded the app and installed it, please run the report and save it. This report will help us get a good idea what has been installed on your system and help us be able to diagnose what may be wrong.
When you have your report, you can attach it when you reply to this message and we can then review it and help you determine what is needed to get your system running well again.
For instructions on how to download your EtreCheck report and attach it to your reply to this message please click https://discussions.apple.com/docs/DOC-250000211
Monitor on iMac going to blue screen after Catalina upgrade
