HT5219 why is my mac not detecting my external display?

So ive plugged my new Acer s240hl to my mac, but the screen is saying no signal and the mac is doing nothing when I click on 'detect displays'

Hello mr13en
If you are having issues with the external monitor, follow the troubleshooting steps in the article below.
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
Thanks for using Apple Support Communities.
Regards,
-Norm G.

Similar Messages

  • Why does my ipad not detected on my lap or I can not sync itunes and updated IOS 7.1.2 this

    Why does my ipad not detected on my lap or I can not sync itunes and updated IOS 7.1.2 this

    The following may help:
    Windows computer: iOS: Device not recognized in iTunes for Windows
    Mac computer: iOS: Device not recognized in iTunes for OS X

  • My Mac Pro (2006) with NVidia GeForce 8800 GT is not detecting a second display.  What can I do?

    My Mac Pro w/ NVIDIA GeForce 8800 GT does not detect a second display from the System Preferences / Displays.  Even though I select the "Detect Displays" button, nothing happens.  I also have Bootcamp and Windows 7 in a partition on my drive.  When I operate with Windows 7, there is no problem detecting both of my displays.  However, when I operate with Windows 7, there is no sound signal sent from my sound card.  When I switch back to the OS X then I get a sound feed from the sound card, but then it will not detect more than one monitor.  I'm ready to pull out my hair.  Anyone have suggestions?

    http://store.apple.com/us/product/MC094Z/A
    Leopard 10.5.6 DVD (Amazon has it for $106)

  • Why is my mac not able to open pdf files?

    Why is my mac not able to open pdf files?

    my internet session closes down and a box appears saying this
    [The Application Safari quit unexpectedly. The problem may have been caused by the Acrobat plug in. Mac OS X and other applications are not affected. Click Relaunch to relaunch the application again, Click Report to see more details or send a report to Apple]

  • Why Aperture 3 is not detecting  all Exposure Program use by my Nikon D5200

    Hi there ! I just wanted to know why Aperture 3 is not detecting  Exposure Program use by my Nikon D5200 camera in my metadata photos ?   It only detects Aperture Mode and Shutther Mode. I should say that using Adobe's Light Room detects all Esposure Programs / Scenery / Effects so the metadadata is there.
    Thanks in advance,

    816475 wrote:
    I have doubt why my below program's thread is not synchronized.A thread can't be synchronized; a method or a code block can.
    Whereas both the thread t1 and t2 shares same object called 't'.So? There is nothing in test that is shared between the two except the method, and that is synchronized, which prevents t1 and t2 from executing it at the same time. What you can't know is whether t1 or t2 will execute first (although t1 probably will more often, simply because it was started first and will hit method() very quickly).
    But if I use the same program by implementing runnable interface instead of extending Thread class, its working fine(ie both thread are synchronized)As isocdev said, I suggest you post the version that uses Runnable as well (and please use code tags as he suggested; for what you've already posted I suggest you just edit the post).
    Winston

  • HT1338 Why will my mac not do a software update

    Why will my mac not do a software update

    Is there any error message provided that indicated why the update fails?
    E.g. "An unexpected error occured" Anythng like that?
    These messages provide guidance for people offering assistance so that it is targetted and appropriate.
    Someone might suggest pulling a plist like /Library/Preferences/com.apple.SoftwareUpdate.plist but if the issue is insufficient space on the Macintosh HD or an error connecting to the Update Server or a security certificate error the removal of the plist would be pointless.

  • My mac not detected flashdisk and iphone5

    my mac not detected flashdisk and iphone5

    You aren't likely to find it here unless you have a specific iBook G4 issue.
    Perhaps you need to repartition and reformat your HDD or reformat the Linux partition and reinstall it.

  • Why dont the Mac Pro's with Retina Displays have a CD/DVD drive?

    Why dont the Mac Pro's with Retina Displays have a CD/DVD drive? Will Apple eventually stop producing CD/DVD drives?

    Gethin R wrote:
    Why dont the Mac Pro's with Retina Displays have a CD/DVD drive?
    Because Apple did not put one in there.
    Will Apple eventually stop producing CD/DVD drives?
    We can't really answer that, but it would not surprise me. More and more of the computers being produced by Apple lack an internal optical drive. If you really need one, get an external such as LowLuster suggests.
    Best of luck.

  • Why is my mac book pro mid 2012 display green flickering screen?

    Why is my mac book pro mid 2012 displays green flickering screen? I was able to return the screen  back to normal after i turn the lid up and down.
    Is this a hardware issue ? should i return to applestore since the warranty still valid?

    It seems like your display is damaged. As your computer is in warranty, take your Mac to an Apple Store or reseller to get the display replaced for free, as it's in warranty

  • My macbook pro will not detect any external monitors

    My macbook pro will not detect any external monitors, worked 'once' when connect to a TV.
    Have read a lot of web comments, most not very usefull.

    Hi a,
    Check the setting in Sys Prefs > Displays.
    Try a different adapter and/or cable.

  • MacBook Pro not automatically recognizing external display

    I have an ACER 2216W LCD display connected to MacBook Pro with DVI cable. When I first plugged the ACER display into MacBook Pro, the ACER started right up -- nice plug and play. I disconnected DVI to bring MacBook Pro to school, and when I reconnected it at home, I received a "NO SIGNAL" error message on the Acer. I sent the Acer to their tech support in Texas after receiving no support from Apple (in Canada) and it tested fine on their PC. (They do not support Mac). When I attach the display, or turn it on, MacBook Pro screen goes blue and comes back quickly, as if it is trying to id the display. When I push "Detect Displays," I get nothing. System Profiler is not showing an external display. Any ideas -- is there a start up command I can try? Thank you! My Photoshop homework is building up.

    MacBook Pro forum:
    http://discussions.apple.com/category.jspa?categoryID=190
    Probably more people there would know the ins and outs of what you are trying to do.

  • Since upgrading to yosemite my MacBook Pro want detect my external display

    Since upgrading to yosemite my macbook pro won't detect my external display ?

    Here's an Apple Discussions thread that might help. It suggests using Disk Utility to repair permissions to fix the following issue, which I just found on my system:
    User differs on “private/var/db/displaypolicyd”; should be 0; user is 244.
    Group differs on “private/var/db/displaypolicyd”; should be 0; group is 244.
    If Repair Permissions doesn't do the trick (because it doesn't stick across sleep and restarts), helpful user "lplacencia" has provided some Terminal commands to patch up the files as needed. With any luck a 10.10.1 update will address this soon!
    I haven't had a chance to test this fix yet, but I will do so later tonight. Meanwhile I can report that booting up in Safe Mode didn't make any difference for me. My system includes MacPorts (which includes some running services) so I might need to eliminate that factor, if Disk Utility doesn't help.
    A total clean install would have to be my next step. (And I might try that anyway just to see if it's a problem in Yosemite generally.) It's not possible to download the Yosemite full installer from Apple through a public website, but you can save the installer and use it to re-install without having to download it again.

  • Why won't my mac detect an external display?

    I have a mac book pro - system OS X 7.3 - but when I plug my rocketfish adapter to HDMI cable to samsung TV - the TV says it gets no  signal. I've done everything the experts have said about connecting with the right specific order. But my display doesn't detect any external devices nor does it show any "mirrored" button. It isn't there any more.

    How do you know it's not recognized and how is it formatted?

  • Mac mini does not detect apple cinema display

    Hello,
    I have bought new mac mini (late 2012) with OSX 10.9.4 installed on it.
    I have apple cinema display (20"), model: A1038 from before. When i turned on mac mini the display was not detected.
    I also have one Samsung monitor which was detected without problems.
    I tried next steps already:
    - connect only apple cinema display with HDMI to DVI and turn on coomputer
    - connect only apple cinema display with mini displayport to DVI and turn on coomputer
    - connect both displays, went to System preferences -> display and click on 2Detect display"
    nothing works
    Specs of my mac mini:
    mac mini (late 2012)
    processor: 2.5GHz Intel Core i5
    OSX: 10.9.4
    graphics: Intel HD Graphics 4000
    Have anyone idea what is wrong?
    Thanks!
    most22

    Hi there most22,
    You may find the troubleshooting steps in the article below helpful.
    Apple computers: Troubleshooting issues with video on internal or external displays
    http://support.apple.com/kb/HT1573
    -Griff W. 

  • After installing Mountain Lion, why screen server does not detect photos from iPhoto?

    After installing Mountain Lion, why the screen server does not detect photos from iPhoto?

    I had the same problem and found the solution here:
    https://discussions.apple.com/thread/3189272

Maybe you are looking for

  • When installing itunes get error "program can't start because msvcr80.dll is missing

    I cancelled the installation of the latest version of iTunes on my Windows PC and when attempting to reinstall it, I now get a message that "The program can't start because MSVCR80.dll is missing from your computer. Try reinstalling the program to fi

  • Opmn server issue

    Greetings, I'm trying to install OBIEE 11g on Oracle VM running Linux 5 and i'm having a couple of issues. My Configuration Progress always fails at this point: Creating ASInstance the error log states the following: Caused by: oracle.as.provisioning

  • Problem using multiple contexts in same thread

    Hello, I am having problem using multiple contexts in the same thread. Here is the scenario: front-end is calling a ejb1 with a user1 and password. Ejb1 is then calling ejb2 using user2 and password. I am getting security exception when calling ejb2

  • Does adding captions to existing JPEGs degrade image?

    Using Photshop Elements 5.0, when I open an existing JPEG file and add a caption, the file's date stamp is changed to the current date, even if I don't actually edit the image. I know that opening, editing and then resaving an existing JPEG file caus

  • My itunes is not syncing my films to my phone?

    hi i have converted my films from avi to meg4 and they are showing in my itunes but not syncing to my iphone, does anyone know why? it may be a setting or something because i can get video podcasts, im on windows xp if that helps, thanks