I applied an OS update to my iMac and upon reboot the screen froze. How do I unfreeze my screen?

I applied an OS update to my iMac and upon reboot the screen froze. How do I unfreeze my screen?

mende1
Thank you for your suggestion, unfortunately powering off/on did not resolve my frozen screen issue.  However, at the advice of Apple Support I powered off my iMac, then powered back on in Safe-M
ode (hold shift key down as you turn the machine on).  This allowed me to get back to my desktop. Then I restarted the machine in normal mode and I'm back in business. 

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