Keyboard and Mousepad don't work on my acer laptop

Donewtech - Updated by Donewtech on 10/12/16 at 08:51 AM
My keyboard and mouse pad still doesn't work after pressing Fn+F6 or Fn+F7. However, I know that the keyboard still works as when I press Ctrl Alt Del it switches to the bit where you put your password in to unlock your laptop. Also, when I tried pressing Fn+F7 the screen just goes black but when I touch the mousepad the screen comes on again. What do I do?