Strange case: trackpad working intermittently - with solution.

Question

Hello Everyone,
I am posting this one in case someone runs into this weird problem.
Recently, I started experiencing problems with my trackpad (MacBook Air - mid2013). The symptoms are as follows:
- Left click stops working. Althoug right click is workine fine. Left click would start working again once in a while.
- Mouse pointer correctly follows trackpad.
- All other trackpad gestures working fine
- Going over the dock doesn't produce the "lense" animation ( ! ).
- Sometimes, a re-boot would fix the problem but usually not.
- The mouse works perfectly fine in the "user selection" screen after the re-boot (left-click works).
I read many threads on the forums here but nothing solved the issue. Because the problem was:
- I had a USB mouse (Magic Mouse), that was ON, under a cushion about 3 meters from the laptop. And somehow it was interfering with the proper functioning of the trackpad.
- Getting the mouse from under the cushion and close to the laptop solved the problem.
This case was so strange that I felt I should write something about it.
Aghiles

Answer 1

I found a solution via users comments on another website: For keyboard problems you have to zap the PRAM; for trackpad problems (including trackpad button) you need to re-set the Power Management Unit. Details at: http://www.info.apple.com/kbnum/n14449
This seems to have solved my problem completely. For added trackpad functionality though I have also added SIDETRACK - which provides scrolling functions and the ability to tap in just one corner of the trackpad in order to left-click, or right-click. There will be less button pushing in general therefore from me in future!