Last Thursday, I downloaded and installed a new Preview CU for Windows 10 — namely KB55053634. After lunch Friday, I finally got around to rebooting to complete that process. Eventually, it succeeded. But first, just to make things incredibly exciting KB5053634 kills mouse, keyboard — my vital USB peripherals — dead. Here’s the story of what I had to do to bring those devices back to life, and actually log in to Windows 10.

KB5053643 Kills Mouse, Keyboard: Now What?

Because I couldn’t get past the lock screen without a valid input device, that turned out to be a little more vexing than one might guess. So first, of course, I rebooted again. Still no joy: the keyboard didn’t respond to keypresses (a good test on my Comfort Curve 4000 is to toggle the Function Lock or Scroll Lock keys because those also toggle handy little green indicator LEDs). Nor did a mouse click open the PIN input box as usual.

So I tried again. Still no dice. Then I thought: “maybe the device needs a cold, hard boot?” That means powering off the PSU, waiting 1-2 minutes, powering back up, and pressing the power button. And indeed, that did the trick. Once I went through that maneuver, the hardware got completely reset, reinitialized and enumerated. It was enough to restore my key USB peripherals to working order.

What (Would Have Been) Next?

If the cold boot or hard boot didn’t work, I’d have had to jump into UEFI, turn off Secure Boot, and then target bootable repair media to get something running on that PC. I’ve done it many times before and will no doubt do it again. But hey: I was glad not to have to do it this time. Cold, hard boot did the trick.

Makes me feel like I dodged a bullet. Remember to give that a try if you find yourself bereft of mouse and/or keyboard after installing a Windows update or upgrade. If you’re lucky like I was, that will bring the USB drivers back into play, and let your PC get back to work. Cheers!