Answer to "Why is my trackpad clicking at random?"Hi, I changed my battery one year ago, after 4 years of good services on a MBP 15. The new battery lasted 1 year, and now is swelling, while the hard drive I changed at the same time lasted only 2 months (now having 2 ssd's). It might be the crash in a car while riding my bike. (you should have seen the car and the bike ;) ... the laptop got a nice dent on a corner, the optical drive died and the hard drive (not a ssd) died shortly afterwards.