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I see from the post that you are having issues with the keyboard not working on your HP notebook. Don't worry as I have a few steps which should help you resolve this issue.
To provide you with an accurate solution, I'll need a few more details:
Have you made any changes on the PC before the issue started?
Was there any update/reset interrupted recently?
Have you tried to use an external keyboard and check if it works?
Do you see any light on the caps lock or num lock?
When was the last time it worked (date)?
While you respond to that, here's a few things you can do:
Perform a Hard reset on the notebook: A power reset (or hard restart) clears all information from the computer's memory without erasing any personal data. Performing a power reset might fix conditions such as Windows not responding, a blank display, software freezing, the keyboard stops responding, or other external devices locking up.
Next thing, I would suggest here is to connect an external keyboard and check if it works.
I hope this helps. Let me know how it goes for further assistance.