Answer to: Why can I not click by pressing down on my trackpadI had the same problem with my trackpad. When I got it the physical click was a bit difficult to register (I had to click hard to have it register). Now a year and a half later it's just worse. I practically have to mash it down with an uncomfortable amount of force to make it register. I would think if it makes the "click" sound it should be registering but this is not the case. I read somewhere that you can adjust the sensitivity by a torx screw on the bottom of the trackpad. By opening the MBP and removing the battery I see a torx screw but I don't have a bit to fit it. I do not believe this issue is a software issue. It happens in Leopard, Snow Leopard, Windows 7, and Ubuntu.