4 Replies Latest reply: Feb 11, 2012 7:28 PM by S.Olson
S.Olson Level 1 Level 1 (0 points)

My mouse cannot left-click on anything. Cannnot open a or close a document by left clicking. It will open or close via pull-down menus and right-clicking. It also cannot select anything or drag anything. I have used several mice, no change. It all works okay when I safe-boot (restart holding down the shift key) but after regular start-up, it doesn't work anymore. Is this a virus?

iMac (27-inch Mid 2010), Mac OS X (10.6.8)
  • Rysz Level 6 Level 6 (8,055 points)

    It's not a virus. There are none for OS X.


    What you describe is the normal behaviour, unless you modified it in preferences: left-click to invoke contextual menu, right-click to select or double-click.

  • S.Olson Level 1 Level 1 (0 points)

    I will restate. I cannot move a window by dragging. I cannot open  anything by double-clicking on a file or program. I cannot select anything with my mouse, BUT I can see the cursor move around the screen. It is useless. I cannot close a file by clicking on the red button in the upper left corner. I cannot set the cursor anywhere and begin typing.  I have used Macs for 17 years. This is NOT normal behavior. It stopped suddenly one day. All preferences are set to normal settings.

  • S.Olson Level 1 Level 1 (0 points)

    Problem solved thanks to Eric Cote:



    "you may want to trash your preference files under:


    Users/<your user name>/Library/Preferences/com.apple.driver.AppleHIDMouse.plist


    then reset the mouse prefs"


    Thank you Eric!

  • S.Olson Level 1 Level 1 (0 points)


    It has reverted to "not working" once again, and now there is no more plist to trash, and even "safe-booting" does not retsore mouse functionality even temporarily.

    Again, mouse will not left click ANYTHING; won't open windows, programs, files, nuthin'.

    Right click will pull down menus, like, for example, System Preferences, but i am unable to click on any icons in the window.

    The ONLY way to close a window now is command-w. Nothing else works.


    Question: will upgrading to Lion give me a clean slate? and ca I upgrade to lion without a mouse?