Mousepad don't work

check if the touchpad is disabled, enable it in settings, update or reinstall the touchpad driver, check BIOS settings, resolve external mouse conflicts, and consider a hardware issue.

@i_am_the_cosmos answers are meant to enable the OP to fix their device. Your answer is way to generic to make it useful. Enhance it by going into details:

enable it in settings, How is that done?

update or reinstall the touchpad driver. Where to get the Drivers and how to update them in the OS?

check BIOS settings Check for what? How to access the BIOS?

resolve external mouse conflicts How to find the conflicts and how to resolve them?

consider a hardware issue. What kind of issue and how to fix that?

AI does not do this very well. You may have to start using human intelligence