|Go here for how to find the Service tag "number":|
Tell us what it is.
I don't know of any setting the laptop itself would have that would disable everything on the built in keyboard.
Have you, or is it possible anyone else has.....
- dropped this laptop, or subjected it to a physical jolt ?
- spilled liquid on it, or exposed it to liquid such as rain, or sprayed it with liquid ?
Has there been a power failure even that happened when the AC adapter was plugged into it ?
Is there a password required, that you don't know, to be able to use the built in keyboard ?
Does a USB connected keyboard work fine ?