middaparka
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Q: External monitor stopped working after 10.9.2 update installation

I've been using a Dell U2712H display for about a year with a mini-display port to display port cable.

 

However, after installing the 10.9.2 update, the monitor is going into sleep mode when connected to the MacBook Pro (as it doesn't think it's getting a signal), even though the laptop thinks it's correctly connected. (If I turn the monitor off, the menu bar, etc. revert to the MBP screen.)

 

About the only related Mavericks default I've changed is to disable the "Displays have seperate Spaces" option within Mission Control, although I've tried re-enabling this and logging off/on again to no avail.

 

I've also tried resetting the NVRAM and the SMC, neither of which appear to have made any difference.

MacBook Pro (15-inch Mid 2010), OS X Mavericks (10.9.2)

Posted on Feb 25, 2014 2:16 PM

by middaparka,Solvedanswer
middaparka middaparka
Level 1 (0 points)
A:

I've managed to get my monitor working again.

 

It's actually a Dell U2713H (the "2712" was a typo in my original post), and I had to disable DisplayPort 1.2 support within the OSD to get it to work again.

 

To do this, you might need to use a bit of a workaround, which is to get the monitor to bring up the input select and then hold down the green tick for ~8 seconds when the (mini-)DisplayPort option is selected. This will bring up a new menu that enables you to enable/disable DisplayPort 1.2 mode. (Green tick to enable/red to disable.)

Posted on Feb 27, 2014 12:53 PM

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middaparka

Q: External monitor stopped working after 10.9.2 update installation

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  • by ebrozilla,

    ebrozilla ebrozilla Jun 10, 2014 11:28 AM in response to middaparka
    Level 1 (0 points)
    Jun 10, 2014 11:28 AM in response to middaparka

    I was never able to resolve my issue with the displayport, but I ended up getting an hdmi to dvi cable for my Dell monitor and everything is working well now.  Apple just seems to hate the displayport. 

  • by Jerry Chrisman,

    Jerry Chrisman Jerry Chrisman Jun 11, 2014 12:42 AM in response to ebrozilla
    Level 1 (0 points)
    Jun 11, 2014 12:42 AM in response to ebrozilla

    Tangentially I don't know if this helps anyone, but all my problems with external monitors getting dropped or not working were all related to a bad external USB harddrive. It somehow was causing the bus to just do loppy things. Replaced the external harddrive and all my problems went away.

  • by Alex Barrantes,

    Alex Barrantes Alex Barrantes Jun 11, 2014 3:20 PM in response to middaparka
    Level 1 (0 points)
    Jun 11, 2014 3:20 PM in response to middaparka

    I had this same issue with AOC USB screen e1649Fwu then I downloaded Displaylink v2.2 and I got my screen running again. Hope it works for other monitors!

  • by zigginl,

    zigginl zigginl Jul 20, 2014 11:28 PM in response to SifakaMon
    Level 1 (4 points)
    iPhone
    Jul 20, 2014 11:28 PM in response to SifakaMon

    Hi, I have just bought a q2963pm AOC and running OSX 10.9.4. Connected through HDMI cable, the font is very blurry. Also tried running SwitchResX  but not improvement. Bought a DP to MINI DP cable, but I can't get this to work either.

    Have you got any ideas what I can try? Thnx

  • by Big.Lou,

    Big.Lou Big.Lou Sep 28, 2014 8:46 AM in response to andrewnez
    Level 1 (5 points)
    Sep 28, 2014 8:46 AM in response to andrewnez

    This worked for me - Thank you

  • by hankovg,

    hankovg hankovg Oct 3, 2014 8:25 AM in response to ebrozilla
    Level 1 (0 points)
    Oct 3, 2014 8:25 AM in response to ebrozilla

    Guys,

     

    Had similar problems where, after upgrading to Maverick, my external monitor and projector did not work anymore.

    I was using a mini display port adapter for VGA of a third party that works perfectly fine on Mountain Lion.

     

    Today I tested it with an official apple cable, and guess what, it works with Maverick!

    Took me weeks to figure this out, so I will not be cheap anymore...

     

    So for everyone who uses third party non-apple cables, please use an official apple cable because Mavericks seems to be much more picky than Mountain Lion. It is at least the case for the Mini display adapter port to VGA cable.

     

    Greetz,

    Hanko.

  • by haihoo,

    haihoo haihoo Feb 11, 2015 6:09 AM in response to hankovg
    Level 1 (0 points)
    Feb 11, 2015 6:09 AM in response to hankovg

    > So for everyone who uses third party non-apple cables, please use an official apple cable because Mavericks seems to be much more picky than Mountain Lion.


    It worked before. Apple broke it with a system update (again with Yosemite) they should fix it. But it seems Apple want to sell their own expensive cables and monitors and disqualifies third party cables with an OS update.

  • by Michael Paine,

    Michael Paine Michael Paine Feb 11, 2015 5:41 PM in response to haihoo
    Level 2 (348 points)
    Mac OS X
    Feb 11, 2015 5:41 PM in response to haihoo

    There is another discussion that is mainly about mirroring/extended desktop not working via Airplay with some iMacs. i have no non-Apple cables - the IMac and AppleTV are on the same home network. I can play movies on the ATV via iTunes on the iMac but cannot use the ATV for anything else. Airplay (video) works perfectly on a Macbook Pro on the same network. It is a bug with Yosemite that only affects some iMacs.

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