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All replies
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Helpful answers
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Aug 22, 2012 4:18 AM in response to Steve Borschby petterast,One thing only worked for me (tried all the above). I had previously switched between my graphicschips (in the power save settings). I had to switch back to the other graphic chip for the macbook pro to be able to send the approporiate signal to my display.
Sypmtoms before:
When connecting the display I get the blue screen when mac detects displays, my display would show green light for half a sec while still black, then back to standby.
In preferences I could see settings for my display when gathered in main dispaly, but no setting worked. My mac recognized the display but could not send the correct signal it seams.
After swithching to the other graphics chip all is back to normal.
This problem occured with two different displays (i tried to connect to my projector as well with different cables) so monitor is not faulty.
Good luck!
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Aug 22, 2012 2:52 PM in response to rickindieby aorrdalca,Had the same problem with my twin Thunderbolt displays daisy-chained to a new Retina MBP. Very frustrating. Unplugging and replugging the displays worked fine.
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Sep 6, 2012 8:45 PM in response to nookiedogby fyuan,I have the same issue when I connceted my 23' cinema display to my 2008 macbook. the display used to work with my laptop in Lion system. but after the upgrade, the display become black. Is there anyone who can help me this? Thanks in advance.
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Sep 7, 2012 9:58 AM in response to fyuanby ilpostino75,Hey, I have the same problem! I have a late 2008 macbook pro and when I upgrade to mountain lion my external monitor LG (m2294A) sometimes works fine and some other times turns black. Pretty annoying!
I will appreciate any help on this matter. Good day
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Sep 9, 2012 4:14 AM in response to nookiedogby wineEngineer,Hello,
I had a similar problem with my mid 2010 macbook pro (Dell 24 inch external monitor connected with a displayport) that I fixed by resetting the nvram, as mentioned previously, but that wasn't enough apparently. I also had to manually disconect the displayport from the monitor side and reconect it as powercycling forcing detecting screens wasn't giving any results whatsover.
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Sep 20, 2012 8:58 AM in response to rickindieby samjpullen,I've done everything in these thread but still no avail...
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Sep 20, 2012 9:07 AM in response to nookiedogby sameerfromwa,I was finally able l solve my problem. I bought a 3rd party mini-display-port to DVI cable and switched out the Apple adaptor and it now works flawlessly. Here's the cable I got: http://www.amazon.com/gp/aw/d/B003OBXHPC/ref=mp_s_a_1?qid=1348157137&sr=8-1
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Dec 26, 2012 3:37 PM in response to samjpullenby rbarba23,How many months must pass before apple addresses this, this has been a known issue since July at least. Every display in my place has issues with this nonsense, and the only real solution has been to downgrade back to Lion. I can only do this with my home machine as my work laptop must remain updated to match the work system. This sort of thing drives me so crazy I can't even begin to voice my anger, why did I pay this company to upgrade my technology when all it did was force my monitors to go dark?
DO SOMETHING APPLE
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Feb 13, 2013 2:54 AM in response to rbarba23by pella6,Hello rbarba23,
I posted my comment on the issue today. Have you had any solutions yet?
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Mar 20, 2013 7:44 PM in response to nookiedogby davidrAppleSupport,Pressing "alt/option" after checking the plugs for tightness worked for me.
Sony Bravia flatscreen via hdmi cable.
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Oct 19, 2013 7:38 AM in response to nookiedogby sunbeam49,While this may be an old thread, apparently the issue still exists as it happened to me yesterday after upgrading from Snow Leopard to Mountain Lion... no external display recognition. I recall having this problem the very first time I attampeted to connect two external displays to a MBP some three years ago using a Diamond adapter. I had to download the Diamond driver in order for it to work. And so yesterday, after all else failed, it all started to come back to me... how, once I learned I needed the driver, & having gone to the Diamond web site where the driver was unavailable, I was directed upon a google search, to displaylink, where one can find a free driver download.
And so I thought, it's worth a shot for it's very possible the upgrade had erased the driver. After downloading the driver, shutting down my computer & unplugging everything, I started the computer back up & reconnected all the hardware & it immediately recognized my two HP displays!