4 Replies Latest reply: Oct 13, 2012 12:35 PM by Lofty Becker
Lofty Becker Level 1 Level 1 (5 points)

All of a sudden my trackpad (with an iMac, wireless trackpad and keyboard) seems to have overdosed on amphetamines. Even when I don't touch the trackpad I get frequent clicks and occasionally pointer movements. Sometimes ten or more a minute, enough to make it difficult or impossible to work.


I've tried what I could think of:


Made VERY sure I wasn't inadvertently touching the trackpad. Nope.


Rebooted. Nope.


Went to System Prefs and turned off both single-click by tap and secondary click with two fingers. Nope.


Replaced the batteries (they were down to 30%). Nope.


Got paranoid -- turned off screen sharing and turned on the firewall, in case someone was taking over the computer. Nope.


At this point I'm pretty much down to (a) hardware malfunction on the trackpad, (b) electrical interference somewhere, (c) weird software bug on the iMac, (d) hardware malfunction on the iMac.


I'm pretty sure it's not hardware on the iMac, because removing the batteries from the trackpad cures the problem. And for the same reason I'm almost certain that it's not software on the iMac that's doing it.


Next step, I suppose, is to borrow someone else's trackpad and see if that solves the problem. Any other ideas?



iMac (27-inch Mid 2011), Mac OS X (10.7.4)
  • RRFS Level 5 Level 5 (4,490 points)

    Not being mean or implying anything, have you cleaned your trackpad thoroughly, especially the detent around the edge?

  • Lofty Becker Level 1 Level 1 (5 points)

    Well, I will clean it -- never hurts -- but there's no "detent around the edge," just a small one at the top. (This is Apple's magic trackpad, not the trackpad on a portable machine).


    Thanks for the suggestion.



  • RRFS Level 5 Level 5 (4,490 points)

    See if you can "pair" it with another computer. If it does the same thing it might have failed. Is there an Apple Store nearby, take it there, if it's under warranty and broken they should give you a new one.

  • Lofty Becker Level 1 Level 1 (5 points)

    Thanks, that’s what I finally did — took it into my office and swapped it with the trackpad there.


    Interestingly, it worked fine for a few hours, then got fired up again. Apparently whatever the failure was required that it be on for a while. Something inside much have been misbehaving when it got slightly warm.


    New trackpad is the final story.