Windows 10: Keyboard alphabet and numbers randomly stops working

Hello I have changed keyboards many times so that isn't the issue. I can't believe I couldn't find a solution for this online as it has persisted with different computers since probably 15 years ago!I use an external keyboard plugged via USB. They all work in the beginning but gradually over time the alphabet/ numbers stop working for maybe 5 or 10 minutes. I turn it off and unplug it then switch it back on but it still doesn't work. Then it randomly starts to work again out of nowhere. Then it progressively happens more and more often. I do use different languages on my keyboard and switch be

:)

 

Some keyboard keys stopped working after windows 10 upgrade

Has the Notebook been worked on? Do any of those keys work if holding down the Shift key? Have you used compressed air to blow out any crud that may be blocking the keys?

It's not expensive nor hard to replace the keyboard, usually can find a video or step-by-step articles on the 'net.
Amazon shows a new keyboard:
Amazon.com: Dell Inspiron 15 (3521 / 5521) Laptop Keyboard - YH3FC - Genuine Dell Part: Computers Accessories

 

Built-in keyboard in laptop randomly stops working / no response

Ok, so recently I found my Toshiba Satellite laptop keyboard sometimes stops working. Nothing at all. The number lock light stays on if it is on but no response from any of the keys....This happens sometimes at boot but sometimes it happens randomly after a successful boot. It can work for any amount of time and then stop working. On average though it usually happens within two hours though but can go all day before it happens again

I decided to take the nuclear option and reformat because I thought it was a virus.

So, after a reformat everything was good and then it started happening again. I haven't installed any software since reinstallation of windows.

I have another USB wireless keyboard and when to use that it works properly but the built-in one still doesn't work until I do a reboot and sometimes even after a reboot it doesn't work.


So what could this be:

1. My computer is 5 years old. Could it be that a dying CMOS battery could affect the keyboard and make it randomly stop working?

2. I also surmised that maybe there was a windows update that affected the keyboard but I haven't seen anything that relates to keyboard or other motherboard drivers being installed.

3. Or could it be the keyboard hardware itself, is it failing somehow? But why would it work properly sometimes after a reboot?

4. Or something else? that's why I came here to ask for suggestions or direct solutions



I appreciate any guidance on helping to solve this frustrating issue

PS:

I tried to use Event Viewer to see if there is an entry that would show if Windows has reported/noticed the keyboard malfunctioning but I don't know where to look in Event Viewer, it's above my technical ability to know exactly where to look. I have tried but I don't see anything obvious.



System Information:

System Model Satellite S50D-A

Keyboard Driver c:\windows\system32\drivers\i8042prt.sys (10.0.15063.0, 112.50 KB (115,200 bytes), 2017-03-18 5:56 PM)

 

Keyboard randomly stopped working

My built in laptop keyboard stopped working after the computer randomly turned off by itself.

(Laptop is a Lenovo Ideapad).

I have tried:

Uninstalling drivers and scanning for hardware changes to reinstall them.

Entering safe mode (computer wouldn’t even start in safe mode).

Entering the BIOS to see if there were any changes I could make there (there weren’t).

Now I am getting Code 19 and Code 12 errors for the keyboard in Device Manager.

I’ve tried all troubleshooting steps on many websites, and nothing works.

External keyboards work when I plug them in.

Please help!!