10.8.4 External Display Problem

Sorry, you are right. His issue seems to be a hardware problem more than a software problem.

Very frustrating. Happened to me as well with a Mac Mini and NVIDIA GeForce 9400M graphics. The odd thing is that I did a complete re-install of 10.8.4 and the screen was fine for a bit. I almost posted on this forum that a re-install would fix it. Then I walked away from the computer for a bit, came back and that black bar on the left came back. Arghhh. Not certain what to think of that but I don't have the time to try another re-install. Hoping Apple fixes it soon so I don't have to look at this stretched screen for much longer.

I'm having similar problem with 1920 x 1080 exteral monitor since upgrading to 10.8.4 last night

Same problem with imac 21"5 and external screen Asus, while putting device 1920x1080 via VGA.

Apple support ? Don't care.

Same here. Mid-2012 rMBP with apple-made adaptor. Happened right after the software update.

Glad to hear that about you khroy. However, here the problem still persists although I have been using an Apple adaptor since always (mini DisplayPort to VGA). Apple please pay us some attention!

Same issue as everyone else here, common demnominator is 10.8.4. I hope they fix this fast.

Just called it in and talked to senior support. Nothing they can do right now but wait for a software update unfortunately. She suggested we post to: http://www.apple.com/feedback/

Only thing we can do is be noisy enough that they pay attention and address this ASAP.

P.S. This is the last time I update my computer to something new right away. Have had more and more issues with Apple with this sort of stuff and have lost a lot of stock in their "it just works" slogan.

OMG STILL NO PATCH

Same problem here...running an iMac 3.06 GHz Intel Core Duo and ever since the 10.8.4 update, the external display is not working. I use a "Apple" Mini-DVI to Video (RCA/S-Video) adapter to an old school 4:3 TV...I read some threads thinking this was a 3rd party adapter issue, but it is not. When I click OPTION-F1, I get either the blue adjustment screen dim, and then nothing happens, or the iMac screen goes black. On both occasions, nothing shows up on the external display (TV). I tested the adapter on my children's computer, which was still running 10.8.3...extended display worked....I updated their OS to 10.8.4 and sure enough, same issue. I sure hope they fix this soon. I was encouraged by an Apple employee friend to submit the problem on their feedback page...the more people the better.

Same problem here...running an iMac 3.06 GHz Intel Core Duo and ever since the 10.8.4 update, the external display is not working. I use a "Apple" Mini-DVI to Video (RCA/S-Video) adapter to an old school 4:3 TV...I read some threads thinking this was a 3rd party adapter issue, but it is not. When I click OPTION-F1, I get either the blue adjustment screen dim, and then nothing happens, or the iMac screen goes black. On both occasions, nothing shows up on the external display (TV). I tested the adapter on a second computer still running 10.8.3...extended and mirror display works....I updated their OS to 10.8.4 to see if the update was the culprit and sure enough, same issue. I sure hope they fix this soon. I was encouraged by an Apple employee friend to submit the problem on their feedback page...the more people the better.

10.8.4 has some video glitches for sure. With me it is minute (single pixel?) green dots that show up on dark backgrounds and the galaxy swirl default screen saver. All was fine until .4 -- somebody talked about using time machine to reinstall 10.8.3. If somebody can explain how to do that I might try it. Otherwise will either look it up or wait for a patch.

My external display doesn't work anymore either since 10.8.4.

I use a Apple DVI to Video Adapter to an old school 4:3 TV also.

I'm on a

I am trying a Time Machine restore back to 10.8.3 to see if this will fix the issue. I will keep you updated.

Time Machine restore worked...was able to revert back to 10.8.3 and the external monitor/mirror display now works!!