Today I tried to login to my desktop happily running Windows 10. I was unable to log in to the computer, because while my mouse worked perfectly, my keyboard wouldn't enter a single key. Instead, I kept hearing a click sound from the speakers every time I pressed a key. I am using a wireless keyboard and mouse from Logitech, and I tried plugging in a wired USB keyboard, to the same effect: only clicks from the keyboard.
Thus, I am unable to enter either my password or PIN code to log into the machine. This is a big problem, because the last time I heard that clicky keyboard sound, it was when I accidently turned on a Windows accessibility feature called Sticky Keys by pressing the shift key too long. That had exactly the same outcome: keyboard wouldn't work, any keypress would result in merely a click sound. I found a workaround -- using my mouse, I opened the control panel, entered Windows accessibility for the keyboard, and turned off sticky keys.
But that was only possibly when I was logged into the machine and it wasn't locked. Now I am locked out and I can't perform this hack.
Any ideas to solve this aggravating catch-22?