Hello,
hour issue might require reinstalling Mac. save all your document first. you can search how to reinstall Mac on Internet. if you needed help contact me.
thanks
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I can troubleshoot your mac with in 2 Hours and resolve your problem.
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I have been using the MacBook for over a year now so I have had the similar problems especially when the new update comes available. I am a 3rd year Computer Engineering Technology student with strong troubleshooting tips with demonstrated command over macOS. I've had solved macOS update problem by using my knowledge and required research so I will definitely be able to help you get done with your imac update.