z33k3r

Q: Yosemite does not recognize external displays...

I just upgraded my Late 2013 MacBook Pro with Retina 15" laptop. I have two 24" monitors plugged in via Display Port to Mini Display Port cables. These have been working great even with the Yosemite Beta 1/2. I reformatted since the betas as they were too buggy for my needs and have been using the external monitors without issue on Mavericks.

 

With today's launch of 10.10, I updated. Ever since the update, I've not had my displays turn on or even blink. When I plug the cables into the laptop, the screen blacks out and then comes back on as you would expect, but the external monitors do not.

 

I've tried:

  • Unplugging all cables, plugging back in in all versions of orders
  • Restarted the MacBook with and w/o displays plugged in
  • Restarted the displays while and while not plugged in
  • Turned off the MacBook completely off with the cables plugged and not plugged in
  • Tried changing to various resolutions with/without monitors plugged in etc.

 

Puzzled... O_o

MacBook Pro with Retina display, OS X Yosemite (10.10)

Posted on Oct 16, 2014 6:57 PM

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Q: Yosemite does not recognize external displays...

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  • by momodei,

    momodei momodei Feb 8, 2015 8:09 PM in response to kpquery
    Level 1 (0 points)
    Feb 8, 2015 8:09 PM in response to kpquery

    I disabled my macbook from going to sleep unplugged everything etc then reconnected it all but my monitor (and my TV which also used to work before the MacOS upgrade) still are not recognised. I have a Moshi min-displayport-HDMI adabptor which I thought was recommended.

     

    I am loathe to go back to an earlier version of the OS. I am living in hope that one day soon I will find a solution so I can use by expensive new LCD backlit monitor

     

    arrgggghhhh - and I can't print greyscale to my colour printer now either - apparently another problem introduced by the Yosemite upgrade.

     

    I wish I'd had warning about these problems and I wouldn't have upgraded my OS

     

    Have Apple said anything at all that anyone knows of ?

  • by skomer09,

    skomer09 skomer09 Feb 9, 2015 12:33 AM in response to Apke85
    Level 1 (4 points)
    Applications
    Feb 9, 2015 12:33 AM in response to Apke85

    Before you hand over your $$$:

     

    1. Ask Apple exactly why they think your thunderbolt port is dead. Ask them to give a detailed technical explanation (even if you won't understand it)

    2. Ask them to produce an electronics report of some sort, showing that they have tested the port and that it is not responsive

    3. Show them this thread

    4. Ask them how they can rule out a software problem when so many of us are having difficulties even when the thunderbolt port seems to be working fine

    5. Ask for a second opinion from another Apple person in the store.

  • by suesue3,

    suesue3 suesue3 Feb 14, 2015 5:24 AM in response to z33k3r
    Level 1 (0 points)
    Feb 14, 2015 5:24 AM in response to z33k3r

    Has anyone had any more luck with this issue? I stupidly upgraded my mac book pro (15-inch, Mid 2009) to 10.10.2 and my external monitor connection via mini display port simply died. I have tried everything suggested on here ( the resets, swapping the cables, pressing the option key when display settings are open, disabling sleep mode etc.) and nothing works. 

     

    Has anyone had success with the uber expensive Apple adaptor fixing this issue? All incredibly infuriating....

  • by Lemonhead72,

    Lemonhead72 Lemonhead72 Feb 14, 2015 9:48 PM in response to z33k3r
    Level 1 (0 points)
    Feb 14, 2015 9:48 PM in response to z33k3r

    Come on Apple... This problem has been around since Yosemite was first introduced. I didn't switch to a Mac to experience problems I havent seen since windows 95. Took me years to convince my better half to make the switch to a Mac. She was sceptic, but a visit to the Apple Store had her sold. She was promised a great user experience and all this stuff I was sold at your store would just work.."trust us" . Now I have a computer that the monitor won't come back on after it sleeps. Well this isn't "working" any better than the old windows PC I replaced. (At least it would sleep and wake).

  • by nukalasr,

    nukalasr nukalasr Feb 15, 2015 10:31 AM in response to Lemonhead72
    Level 1 (0 points)
    Feb 15, 2015 10:31 AM in response to Lemonhead72

    I was using mini display port to HDMI to external monitor.  It was working for long time but failed after upgrading to Yosemite.  It is strange, it did work for some time but failed after couple restarts.  I went through trying everything and failed until I changed to using another cable mini-display port to s-video adaptor and s-video to hdmi adaptor. 

     

    It works now for few minutes.  I will update the post if it fails again.

  • by suesue3,

    suesue3 suesue3 Feb 17, 2015 2:48 PM in response to suesue3
    Level 1 (0 points)
    Feb 17, 2015 2:48 PM in response to suesue3

    Replying to my own original post as I hope this will help someone...After hours of reading and trying every reset under the sun apart from reinstalling the o/s, I unplugged the monitor as I read this in someone else's post from a different thread.  I waited a little, plugged it back in and now external monitor works again and is recognised. 

     

    Sometimes it's the simplest things! 

  • by Apke85,

    Apke85 Apke85 Feb 17, 2015 6:43 PM in response to suesue3
    Level 1 (0 points)
    Feb 17, 2015 6:43 PM in response to suesue3

    Unfortunately for me nothing so simple. They run all the test and said my 2 ports were dead. So now I'm going to spend 280$ to replace them since my warranty expired 40 days ago. they are going to test also a problem with the hdmi port. It did not work hdmi to VGA but only hdmi to hdmi... Apple mistery

  • by hooverhoff,

    hooverhoff hooverhoff Mar 6, 2015 8:56 AM in response to z33k3r
    Level 1 (0 points)
    Mar 6, 2015 8:56 AM in response to z33k3r

    Hey everyone, I'm not a pro but I've found at least one work around/solution.

     

    The problem:

    When upgrading to Yosemite the external monitor is not recognized or it flickers or pixelates or distorts aspect ratio (multiple symptoms).

     

    Solution:

    I read all the descriptions/posts and fixes and started playing around with un plugging, rebooting, generally everything I could think of that was obvious. I found that turning the external monitor on and off repeatedly will eventually lock it into 1600x1050 resolution and work fine.


    I do believe it will be the same problem every time the machine goes to sleep. But at least it is a work around until a permanen hardware or software fix is available.

     

    Hope this helps,

    Hooverhoff

  • by Victor from Arg,

    Victor from Arg Victor from Arg Mar 6, 2015 3:02 PM in response to z33k3r
    Level 1 (0 points)
    Mar 6, 2015 3:02 PM in response to z33k3r

    Im running into the same problem. Both my MBP 2008, and my MBA 2011 wont pick up my Dell u3014. Tried different cables. Tried both the MiniDP and regular sized, 3 different cables. no luck.

    MiniDP to HDMI works ok on both computers.

     

    WTH Apple? Tried NVRAM reset on both machines, no luck either. I want to try the multiple NVRAM resets in a row, but didnt have the time to fiddle with it any more.

     

    Pretty annoyed with this crap.

  • by Mccooler,

    Mccooler Mccooler Mar 9, 2015 9:48 AM in response to suesue3
    Level 1 (0 points)
    Mar 9, 2015 9:48 AM in response to suesue3

    This worked for me as well. I tried all the resets before this to no avail.

     

    Unplugged the monitor and sure enough... Simple yet sooooooo frustrating.

  • by DukeOfWapping,

    DukeOfWapping DukeOfWapping Mar 20, 2015 4:18 AM in response to Mccooler
    Level 1 (0 points)
    Mar 20, 2015 4:18 AM in response to Mccooler

    McCooler and SueSue3,

     

    Due to the panic of not being able to get my MacBook 13 to recognise an external monitor via Thunderbolt to VGA - my brain has become fried and I'm going to ask a potentially silly question.

     

    When you say "unplugged the monitor", do you mean disconnecting the monitor from the mains/power source (wall socket)? Or do you mean just unplugging its adaptor to the Thunderbolt Port?

     

    I'm on the verge of losing the will to live. I desperately needed to use the laptop for a projector based presentation and the black screen of death caused untold panic.

     

    Thanks in advance for your patience and help.

     

    Has anyone else had problems getting the Thunderbolt 1.2 firmware update to work? I keep getting the "please update your Thunderbolt firmware first" warning and I can't get any further. I've followed instructions about having the lid open. Which confuses me. Is there anyone who can use their laptop with their lid closed? Particularly one that you can't connect an external monitor to.

     

    Even at the screen preferences level, it appears as though nothing is connected to the thunderbolt port.

     

    Not happy and grateful for any help.

     

    Many thanks in advance for your help.

     

    Andy

    Mac 13 - Late 2011

    Yosemite

    Thunderbolt to VGA Adaptor

    Generic VGA Projector

  • by hooverhoff,

    hooverhoff hooverhoff Mar 20, 2015 5:47 AM in response to DukeOfWapping
    Level 1 (0 points)
    Mar 20, 2015 5:47 AM in response to DukeOfWapping

    I did not un plug the monitor, I simply cycle through the on off button a

    few times. But I'm using Yosemite. I can't tell if you are too.

    Hope this helps.

    Hooverhoff

     

    On Fri, Mar 20, 2015 at 4:14 AM, Apple Support Communities Updates <

  • by DukeOfWapping,

    DukeOfWapping DukeOfWapping Mar 20, 2015 6:29 AM in response to hooverhoff
    Level 1 (0 points)
    Mar 20, 2015 6:29 AM in response to hooverhoff


    Hello Hooverhoff,

     

    Thanks for your reply.

     

    I am indeed on Yosemite as well.

    On a MacBook 13. 2011 model.

     

    I am away from my laptop at the moment but look forward to trying this on/off/on technique with the monitor.

     

    At this stage, I don't mind if the process is quirky - I just want this to work.

     

    Thanks in advance everyone.

     

    - A

  • by Victor from Arg,

    Victor from Arg Victor from Arg Mar 20, 2015 8:15 AM in response to Victor from Arg
    Level 1 (0 points)
    Mar 20, 2015 8:15 AM in response to Victor from Arg

    Ok, randomness presents itself again. Now it works with a different cable that DID NOT WORK before.

    The one that did work before yosemite, still doesnt.

     

    At least i got it working...so yay? This is both on the 2011 air, and a 2008 mbpro.

  • by volnoir,

    volnoir volnoir Mar 20, 2015 9:04 AM in response to z33k3r
    Level 1 (0 points)
    Mar 20, 2015 9:04 AM in response to z33k3r

    I can confirm, power cycling my monitor worked for me.

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