Mouse problem (but it's not the mouse)

Discussion in 'Mac Basics and Help' started by Stormz, Apr 15, 2016.

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  1. Stormz, Apr 15, 2016
    Last edited: Apr 15, 2016

    Stormz macrumors member

    Stormz

    Joined:
    Aug 21, 2007
    #1
    Hi. For the past fortnight, my Mac has been driving me utterly crazy. It's mouse-related but not caused by the mouse.

    The problem is this. If I drag something - say, moving a file, or highlighting over some text - it frequently 'loses grip' of it too early, even though I've still got my finger on the mouse button. This is super-annoying and only made worse by the fact that, while my finger is still held down, it sometimes regains the 'grip', so it becomes a new click and drag. Cue lots of mislaid emails and files, FTP mistakes, etc.

    Also, double-clicking to highlight a word ends up coming out as either a single-click or a triple-click (which highlights the whole line of text).

    It's intermittent but more often happening than not.

    I use a wired mouse on a 2010 MBP running the latest Yosemite, 10.10.5.

    - It's not the mouse. I've tried 3 of them, all wired. Same thing happens with each.
    - It's not the mouse mat - tried different surfaces.
    - It's not any one USB port - I've tried both ports on my MBP, and the keyboard ones too.
    - It's not any open applications - it happens when I just have Finder open. (No login items.)
    - Bluetooth is off. It's not that.
    - I've played around with the System Prefs > Mouse > Double click speed. High, medium and low. It still happens.
    - I've deleted the mouse prefs files like ~/Library/Preferences/com.apple.driver.AppleHIDMouse.plist and restarted. No joy.
    - I've checked 'Ignore built-in trackpad when mouse or wireless keyboard is present' in Accessibility Preferences.
    - I've verified & repaired permissions in Disk Utility - still happens after that.
    - I've verified disk in Disk Utility - it reports that my disk is ok.
    - It's not my Mac user account - I created a brand new user account, and it happens in that also.
    - I've booted in Safe Mode. The problem still occurs in that.
    - I've zapped the PRAM.
    - I've done an SMC reset.
    - I've run Apple Hardware Test (basic and extended) - no trouble found.
    - I've reinstalled Yosemite 10.10 from a thumbdrive (not a clean install) and it still happens.
    - If I switch from my USB wired mouse to a bluetooth mouse, the problem doesn't occur.

    Based on the above, where do you think the problem likely lies?

    Anyone had anything similar? Is there anything else I can try before doing a complete erase and install?

    Thanks.
     
  2. richard2 macrumors regular

    richard2

    Joined:
    Oct 21, 2010
    Location:
    England, United Kingdom
  3. Stormz thread starter macrumors member

    Stormz

    Joined:
    Aug 21, 2007
    #3
    The trackpad works fine. (On the MBP I mean. I don't use an externally connected one - just mice.)
     
  4. richard2, Apr 15, 2016
    Last edited: Apr 15, 2016

    richard2 macrumors regular

    richard2

    Joined:
    Oct 21, 2010
    Location:
    England, United Kingdom
    #4
    It could have a fault that's causing it to erroneously register input.

    Try the following:

    1. Open System Preferences.
    2. Choose Accessibility.
    3. In the left pane, select Mouse & trackpad.
    4. Enable the option Ignore built-in trackpad when mouse or wireless keyboard is present.
    5. Observe whether the issue reoccurs.
     
  5. Stormz thread starter macrumors member

    Stormz

    Joined:
    Aug 21, 2007
    #5
    Thanks Richard. I should have mentioned, I've already done that. Doesn't make a difference.
    [Have updated original post]
     

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