Windows 10: NO keyboards working - not built-in, not usb, not on screen. None work

I have a surface laptop that a customer brought in and no keyboards work. I have tried the built-in, an external via usb, and on-screen keyboard and none work. I got lucky and upon a restart only could i get the USB keyboard to work long enough to put in the user's password then it stopped again. If i restart again, it will allow me to put in the password but only with the external and as soon as you're logged in it doesn't work anymore. I have tried updating drivers, didn't help. Tried restoring to a previous point, didn't help. Tried updating to 20H2, didn't help. I cant access the registry

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Built in keyboard not working

I recently purchased an ASUS ROG GL553VD Notebook Computer and a few weeks ago the keyboard stopped working. After a few restarts it worked again, but today the problem came back, and was not fixed by any amount of restarting. Several people on past posts said to reinstall they Keyboard driver, but there was no Keyboard section in the Device Manager. I am currently resetting the laptop to factory settings to see if that fixes the issue. Any other suggestions would be greatly appreciated.

 

Built in keyboard not working

I would attach a USB keyboard to it and see if that works.

 

Built in keyboard not working

Certainly try this, also does it work flawlessly in the bios or a live disc? If so you have one odd OS issue, if not I'd suspect a cable issue, while the keyboard itself could be failing a specific key would be more common to work intermittently than the whole keyboard.