Applied Sonoma update and now my iMac 27 will not reboot

By the way, try restarting in Safe Mode. If your iMac uses a wireless keyboard, please plug the charging cable into the Mac and the keyboard and execute the Safe Mode restart. If it boots, then restart normally and you should be in business.

BTW, do you have any of the following third party apps installed on your Mac?

·      Antivirus Apps

·      Cleaning Apps

·      Security Apps

·      VPN Apps

·      Maintenance Apps

time To call AppleCare.If you are in the USA use (800) 275-2273.

Shut down the computer and then restart while holding down the power button for about 15 seconds.