profputr

Q: OSX Mavericks does not detect external monitor

After upgrading my MacBook Pro (15" Mid-2010, NVIDIA GeForce GT 330M 512 MB) to OSX 10.9, my Mac no longer detects my Cinema HD Display.  Any help much appreciated.

MacBook Pro, OS X Mavericks (10.9), Apple Cinema HD Display

Posted on Oct 31, 2013 12:16 PM

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Q: OSX Mavericks does not detect external monitor

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  • by si77hayward,

    si77hayward si77hayward Dec 9, 2014 2:41 AM in response to masterudon
    Level 1 (9 points)
    Dec 9, 2014 2:41 AM in response to masterudon

    Same issue as of today.

     

    iMac 27" Mid 2011 using OSX 10.10.1 - HDMI DisplayPort to Benq external monitor stopped working.

     

    Tried restarted, unplugging, re-plugging, holding down option key in Sys Prefs, nothing!

     

    Thankfully I had a VGA adaptor lying around.  Plugged that in and it detected it instantly.  Picture looks crap but at least it works for now.....

  • by thomasj88 ,

    thomasj88 thomasj88 Dec 27, 2014 4:37 PM in response to KillDash9
    Level 1 (0 points)
    Dec 27, 2014 4:37 PM in response to KillDash9

    Thank you it worked for me!

  • by Lucien Palmer,

    Lucien Palmer Lucien Palmer Jan 23, 2015 7:15 AM in response to KillDash9
    Level 1 (0 points)
    Jan 23, 2015 7:15 AM in response to KillDash9

    Thank you, KillDash9

     

    The hidden 'detect displays' option solved a huge problem I had with one of my three displays not being 'found' if I turn the displays of/on while my Mac Pro is still running.

  • by tomjoy,

    tomjoy tomjoy May 7, 2015 2:21 AM in response to profputr
    Level 1 (0 points)
    May 7, 2015 2:21 AM in response to profputr

    We have now had two display monitor adapters stop working after updates. The first was on a 2009 MacbookPro when we upgraded to new software. We paid £65 for an HDMI to Mini Display Port adapter and when we spoke to apple they would only help if we paid their support fees(£30 I believe). They're not stupid, they know what they are doing and that it will make some hardware obsolete. They said Apple Software was not under warranty just hardware and blamed our ‘Old’ Mac hardware(3yrs old at the time). Yet when we then bought the latest adapter, it worked fine with the new update.

     

    We are now experiencing the same issue with our new Thunderbolt to DVI adapter after our latest update on our 3yr old imacs.

     

    They(Apple) are ripping the **** out of us consumers. Our entire studio was all Apple, now only our desktops are as they no longer provide the Premium service that got them where they are today. Everyone has gone Samsung phones & tablets. Watch the demise of Apple Pro Hardware people, it's going to happen at this level of service.

  • by stutteringfish,

    stutteringfish stutteringfish Jun 21, 2015 8:00 PM in response to profputr
    Level 1 (0 points)
    Jun 21, 2015 8:00 PM in response to profputr

    For what it's worth I had the same issue whereby the monitor was detected but the cinema display was blank (black) like it was turned off, but for the last 4 hours it appears it's been fixed through trial and error.

     

    • I am running a 27-inch display across my MacBook Pro 15" (2011), the monitor is ~ same year (HD6750M)
    • The computer is now running Yosemite (note: I do not recall whether the detection issue was a problem, or not, on the previous OS),
    • THe computer is otherwise running factory set/built hardware, no changes,
    • The connection between monitor and computer is via the Thunderbolt port,
    • I would explain my issue of "detection" as intermittent given there was a time the laptop was successful in detecting and displaying the screen as a second monitor. It has always detected the monitor, just not displayed anything on it!

     

    The solution, in may case: After trial and error, as well as the suggestions I acted upon as posted here which came to no avail - I routed the power supply to the monitor directly to a new power source and not on the wall sockets that supply all of my other devices. In other words I used an extension cable from another source in my office that did not carry supply to another or neighbouring device in the list of equipment I have permanently on: modem, router, PC (yikes), printer, another monitor, etc, etc) and used that as my only power source to the cinema display.

     

    The operation has proved successful in my case so I posted my response here for others in the hope it too helps you. Good luck!

  • by stutteringfish,

    stutteringfish stutteringfish Jun 28, 2015 9:05 PM in response to stutteringfish
    Level 1 (0 points)
    Jun 28, 2015 9:05 PM in response to stutteringfish

    Sorry. Let me retract that offering! My machine has gone back to not detecting the cinema display. Back to square one for me.

  • by davidhq,

    davidhq davidhq Jul 15, 2015 5:07 AM in response to si77hayward
    Level 1 (0 points)
    Jul 15, 2015 5:07 AM in response to si77hayward

    I had the same problem and I used `gfxCardStatus` v2.3 to switch to Discrete only graphics card and now it works.

  • by profbg,

    profbg profbg Nov 17, 2015 7:04 PM in response to profputr
    Level 1 (17 points)
    Desktops
    Nov 17, 2015 7:04 PM in response to profputr

    I have the same problem (there are several threads on this topic), but as you found this after upgrading to Mavericks and I am using OS 10.8, that eliminates one path for me.  Thank you and good luck.  

  • by davidhq,

    davidhq davidhq Nov 17, 2015 11:52 PM in response to profbg
    Level 1 (0 points)
    Nov 17, 2015 11:52 PM in response to profbg

    After upgrading to El Capitan my problems stopped

  • by yolomcguy,

    yolomcguy yolomcguy Nov 27, 2015 8:51 AM in response to profputr
    Level 1 (0 points)
    Nov 27, 2015 8:51 AM in response to profputr

    What I found is the fastest way is to plug in your monitor and then just restart your computer with the monitor connected and it should be recognized.

  • by robwilliamsuk,

    robwilliamsuk robwilliamsuk Dec 21, 2015 6:07 AM in response to KillDash9
    Level 1 (0 points)
    Dec 21, 2015 6:07 AM in response to KillDash9

    Thank you for pointing this out KillDash9, You've saved a lot of frustration.

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