Hi, I've run into a vey interesting/perplexing problem. My PC has two users on it, one is local with no password and the other not local and password protected. When I try to switch between users my wired USB keyboard becomes unresponsive - if I'm switching to the account that requires a password, I can't type it in. This problem occurs regardless of which account I'm switching to.
I've tried uninstalling all the keyboards through device manager and rebooting. Keyboard works until I try to switch users.
Interesting development that I stumbled across - if I just unplug the keyboard and plug it back in everything is fine until I try to switch users.
During my research, I found an article that referenced disabling the XHCI and enabling legacy USB support. Problem with that, is that I haven't been able to find that setting in the BIOS anywhere.
OK, now if 2 other people hadn't seen the symptoms, I'd think I was crazy. Before testing your recommendation, I thought I'd double-check that I could still re-create the problem. I was shocked and amazed that everything worked normally.
I forgot to mention in my original post that I tried multiple keyboards (even a wireless one) and multiple USB ports (both 2.0 and 3.0) with the same symptoms occuring. I even booted into Safe Mode, where everything worked yet when I re-booted normally the symptoms re-appeared.
I checked Windows Update and no new updates were applied without me knowing it, so now I'm totally dumbfounded.
I'll keep your suggestion in my back pocket just in case the problem re-occurs and try it then. Hopefully I won't have to.
Thanks for your "help" - usually it's me doing that to my kids when they have a problem with they're computer :)!!!