So, Just as it says. I own a computer store, and I sell apple. We have a 2014 iMac so as a selling point I chose to upgrade it to Catalina... Now, after the upgrade, the USB keyboard and mouse don't work. Worked fine in Mojave, but once the upgrade was done, I was able to go through set up and choose internet and etc. Once the setup phase was done, and I was at the desktop main screen, USB keyboard and mouse do not work? It only pops up the box for "looking for bluetooth keyboard and mouse" the keyboard lights work (when caps lock or num lock is on) and the laser on the mouse works so I know they are getting power, they just don't function... any words of wisdom before I put Mojave back on it? I searched the apple forums and no one seems to have run into this issue... it's a 2014 iMac 21.5", i5, 8gb, 500gb.