Previous 1 2 3 4 5 6 7 Next 95 Replies Latest reply: Dec 29, 2014 4:33 AM by dansantner Go to original post
  • w.j.m. Level 1 (0 points)
    Had the exact same jumping cursor (really not ideal when working in FCP) problem with my Magic Mouse on my 27" imac i7. Sure enough, I wrapped some foil around the mini display - DVI adaptor running behind my imac, poof! . . . problem disappeared! A total fix. Now if Mac could come up with a real fix so my workstation doesn't look like a grade seven science project I'd appreciate it.

    Thanks for posting the picture furrytoes, otherwise I'd have had no idea what I was doing.
  • Turbomac Level 1 (10 points)
    Well this has got to be one of the strangest fixes I have seen. Got my 27" iMac 2 weeks ago and the jumping Magic Mouse cursor and the delayed Magic Trackpad has been driving me crazy. But sure enough, turned on the second monitor and everything goes away. I even tested a couple of times because I couldn't believe my eyes.

    I'm using a 3rd party Mini DisplayPort to DVI adapter. Is anyone seeing this with an Apple adapter or are all of these issues with 3rd party ones?
  • Paul195 Level 1 (0 points)
    I have been having this issue too. I am using the second screen for

    A) Secondary display for iMac
    B) Display for PC

    I am currently alternating between the two functions above using the input selector button on the external display.

    In my case the erratic mouse problem exists:

    If the screen is off
    If the screen is on input from PC

    The problem disapears when I select the input from the iMac, or I disconnect the MDP adapter totally. The MDP adapter is a third party product.

    A fix? Or some acknowledement of this issue would be nice...from Apple or anybody.

  • Aneusomy Level 1 (5 points)
    Same thing here--

    iMac 27" 2010 i7; erratic/jumpy Magic mouse and trackpad when the external monitor is connected (and OFF); problem resolves if external monitor disconnected from port, or turned ON.

    I have two of the same MDP adapters, both Apple brand, and they both have the same problem. I will try the tin foil...
  • david crooke Level 1 (15 points)
    i just tried a suggestion made in this thread which was to turn off wi-fi my mouse immediately started performing as it should.
    I am fortunate I have a desktop computer next to it (which incidentally doesn't have this problem) which i could turn on internet sharing and use ethernet for my internet.
  • padcreative Level 1 (0 points)
    Just wanted to confirm that the foil around the second monitor's DVI cable has dramatically improved the jumping mouse problem. It has gone from about 4-5 jumps an hour to maybe a couple of times a day. I could probably improve that if I move the cables around a bit, but I can live with it now. Thanks to those who came up with the solution.

    BTW, I didn't have have an DVI-MiniDVI block adapter, it was an all-in-one cable.
  • RotelTHX Level 1 (0 points)
    The solution that worked for me (HD 5770, Mac Pro) was to connect the second monitor via an ACTIVE single link MDP to DVI adapter. Tried before with a passive one and had my mouse pointer jumping. You can get AMD certified adapters for Eyefinity ( - those are all active ones. The dongles sold by Apple are passive adapters except for the really expensive dual link adapter.

    Just buy a 3rd party ACTIVE adapter (e.g. the Accell B087B-006B) and everything will go back to normal.

    Now my mouse is smooth again with dual display setup!
  • Gemini_74 Level 1 (0 points)

    The fix for me was to unplug all of the USB connections and magically the cursor stopped jumping around.  I tried to change the batteries also but it didn't help.  I also tried to restart several times but it didn't help.  As soon as I unplugged the USB cords it stopped.

  • Dr Sin Level 1 (0 points)

    My first post on support forums!


    I experienced the same problem as many of you with my magic mouse behaving erratic.


    After som browsing I found a tip and changed the chanel on my WiFi-router and since I haven't experienced any problems with my bluetooth magic mouse! *Knock on wood*


    Hope this helps!

  • Christiaan Level 3 (525 points)

    Gemini_74 wrote:


    The fix for me was to unplug all of the USB connections and magically the cursor stopped jumping around.  I tried to change the batteries also but it didn't help.  I also tried to restart several times but it didn't help.  As soon as I unplugged the USB cords it stopped.

    That is strange. It works for me too!!?


    Which is a problem because my keyboard is USB!

  • Chris Cline1 Level 1 (0 points)

    I began having this problem after turning on the bluetooth adapter under VMWare Fusion. I have reset my PRAM and the problem seems to have stopped and I am currently running another monitor using 3rd party DVI to MDP on a 15" 2.8Ghz i7 Macbook Pro.

  • fatclockman Level 1 (0 points)


    I also turned off my wifi and the problem has completey gone.  Track pad works flawlessly.  I do not need the wireless as the macpro is connected to my home network, but this does seem a little lame

  • Michal Hobot1 Level 1 (5 points)

    I have a big jumping problem when I have WiFi (AirPort) turned on in the office, but no such problem at home.

    Maybe the problem depends on the WiFi channel used? I don't know how to check the channel number in the office - MacOS doesn't seem to provide such an information in network parameters.

  • Chael Sonnen Level 1 (0 points)

    Thank you so much!!!!!!!!!!!


    I bought the Accell B087B-006B and 6 ft DVI-D Single Link LCD Flat Panel Monitor Cable - M/M for about $35. I figued it was worth a shot after reading your post. After months of trying other stuff that was recommended, I finally am back to a dual monitor setup without the Mouse freezing and jumping all over the place! I was about to buy a replacement monitor to see if it would solve the problem. I'm glad I was able to solve this cheaply.  I can finally work with 2 monitors again, I can never go back to a single monitor!! Thanks!!


    FYI, before I was using the passive cable here: (6Ft Mini DisplayPort to DVI Male Adapter Cable for Apple Macbook, Macbook Pro, iMac, Macbook Air, Mac Mini Laptop)


    BTW, I also use streermouse because I can never get the default mouse driver in OSX to behave the way I want.

  • davidfromtas Level 1 (0 points)

    my mouse is attached by a wire, but it still jumps. i mean huge jumps, depending on how far i've moved it since it froze.  just directing it to a field is very tricky.  disconnecting and reconnecting will get it moving again when it freezes for such a long time i fear it is not gonna come back...

    anyway, maybe its a new topic, all reports seem to be wireless mouse related..