Why my mouse pad is not orking

@nandu40616 this could be a driver issue. You did not tell us what you have tried and what OS you are using. Try this first:

• Press Windows key + X
  Go to Device Manager
  Expand the Human Interface Device or Mice and other pointing device
  Look for HID Touchpad driver that was installed
  Right click and Uninstall.

Next go to this site and look for the Touchpad Driver. Install the driver, restart your computer and enable touchpad in the settings.

If that does not work, you must consider replacing the touchpad. You can use something like this video as your guide. Of course, you can also download the manual from here Page 45 will tell you how to replace the touchpad.