MacBook Pro (Mid 2012) trackpad delay / failing I have a MacBook Pro (13-inch, Mid 2012) and some days ago I realize that the trackpad mechanical click sometimes not click. I mean, the trackpad is pressed but the click not work on the first time, and I need to press for the second time works fine.

When this happen, if I to click slowly works too. This may be a hardware issue? I'm asking that because the tap click works everytime.
This could also be a setting in Trackpad settings within System Preferences. Look for 'Trackpad' in System Preferences (second row of icons, fifth from left). There is a checkbox for 'Silent Clicking'. Check to see if that has been checked on by accident.