Black startup screen after latest update
how do I clear a black screen after latest update last week. This happened with the previous update too.
iMac Line (2012 and Later)
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Please reset the NVRAM and if necessary restart in Safe mode which could take up to 10 minutes to complete. After doing so please post an EtreCheck report of your system.
NVRAM reset instructions are in https://support.apple.com/en-us/HT204063
Safe Mode restart instructions are in https://support.apple.com/en-us/HT201262
Please navigate to the Mac App Store and download the free version of EtreCheck OR please click www.EtreCheck.com where you will find the app. Once you downloaded the free app and created the report please post it as your reply to this message. In order to post it, please use the following link for more detailed instructions on how to correctly include the results:
https://discussions.apple.com/docs/DOC-250000211
We can then look for obvious issues that may be causing your problem.