I have a mid 2010 MacBook Pro and the Trackpad doesn't respond to clicks no matter where I press it. It makes the noise, but nothing happens. I checked to see if battery bulge was the culprit but it's perfectly normal. Thankfully I can use the laptop by tapping and all the gestures still work. Though I do prefer holding down left click to drag instead of the 3 finger tap. I am in the middle of formatting the drive but I don't think that is going to solve the issue. When booting into recovery I lost all the tap functions and could only move the cursor. I had to use a USB mouse to continue.