USB extended keyboard not recognized after software update
Looking for support concerning my iMac (Retina 5K, 27-inch, 2019) failing to recognize the USB extended keyboard after every software update. I have been able to get the keyboard to work in past updates by resetting SMC, PRAM, and doing the shut down dance (un-plug power and all USB connections, hold the power button for 5 seconds, restore power, restart, and plug in the keyboard USB). And yes, the keyboard works just fine on all other apple computers.
However, with update to Version 12.0.1 (21A559) am unable to get the wired keyboard to be recognized. I can connect an apple non-extended bluetooth keyboard with no problem.
Is there any magic I have missed trying to get the keyboard to be recognized?
Do I have to purchase a bluetooth version of my wired extended keyboard?
iMac 27″, macOS 10.13