Some times double tapping the top left corner of the touchpad enables/disables it.
Also check the F1 to F12 keys, they may have a picture of a touchpad on,if so press that button and the FN key.
To. check if it's a hardware fault tap f2 when you turn the computer on to go into diagnostic the touchpad should work in here, if not then the touchpad is faulty
Left me know the results.