[NAME]  They don't make things like they used to... Assuming all your USB ports are still working, the KB likely failed. Guess you could test it on another PC to see what happens... If you see the KB error again, you may need to reset BIOS to clear that error, even though you're using a different keyboard. BTW: When was last time you replaced the motherboard battery?
I have a Dell Inspiron 3650 running Windows 10.  The computer was powered on and was running fine, then suddenly I got an audible notification sound out of the blue (e.g., the same sound you get when you disconnect a USB drive) and my wired keyboard (that came with the computer) simply stopped working. Both the Device Manager and Control Panel > Hardware and Sound > Devices and Printers do not even show a keyboard listed with only the old keyboard connected.  With the replacement keyboard connected, they both register it as the only keyboard device connected. Any suggestions on how to resolve this issue would be greatly appreciated.
Inspiron 3650 Keyboard Failure