Access ok but won't click
Question for a champion Mac:
I have a Macbook Pro mid 2009 3.06 GHz Intel Core 2 Duo.
I do not understand why I could scroll the mouse or trackpad but I could not click on anything. Even the deliberately hidden dock did not appear. I quickly realized that this was a problem "hardware". Having tried everything, my girlfriend told me to try to remove a screw from both covered below. What I did and MAGIC. I noticed that in the last two-tightening screw corner (below the screen) I still lost the ability to click.
Q. - Where is the problem?