2012 iMac Flickering Screen.

I have a new 27" iMac and the screen just started flickering. I've had the iMac for about 6 months and the flickering started about 2 weeks ago, well I noticed it about two weeks ago. I can't find any hardware updates, any suggestions?

You are in warranty. Call Apple for repair. Typically, built-in monitors that flicker are not user-fixable. It portends a hardware problem.

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  • 2012 iMac Screen flickering

    I just bought a brand new, but previous generation 27" iMac a couple of weeks ago, and today I have begun experiencing some noticeable screen flickering.  It doesn't go black, and there is no yellowing.  I have read reports of past iMac flickering problems from 2010, etc, but haven't found much info on those bought in 2012.
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    2.7 GHz Intel Core i5
    4GB RAM
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    I had screen-flicker and color-distortion issues on my mid-2011 27" iMac about two weeks back. The issue ended up being a bad video card (AMD Radeon HD 6790M 1 GB).
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  • Flickering Screen on new iMac late 2012

    I have a very new 27" iMac since 5 days and my screen turns into a disco, which is not very helpfull during work
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  • My screen on my 24" iMac flickers as if the power is flickering.

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  • 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.
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  • New iMac 27inch screen flickering/tearing/shutoff (continued)

    This thread is a continuation of [New iMac 27inch screen flickering/tearing/shutoff|http://discussions.apple.com/thread.jspa?threadID=22 12682]. The thread was becoming too long and was causing some browsers to time out. The older thread has been locked.

    citrus101 wrote:
    Hi Brett L,
    thank you for the coordination of this helpful thread. Are you Apple? If yes, please allow me to ask you three questions:
    1) The Display Firmware stopped for over 90% the flicker issue, but what has this Firmware changed exactly?
    2) Is Apple preparing a fix for the yellow tinge?
    3) When will it be save to buy a new iMac?
    Thank you for your efforts.
    Hello Citrus.
    Excellent questions.
    I hope that Apple will authorize Brett L. to provide us with some clear, honest answers to them . . . although, as I pointed out before, it would seem by the latest messages that have been posted in this thread -- that is, the *original thread* -- that through their actions, Apple has already provided us with their answer -- and solution -- to the yellow tinge issue; and that is the replacement of the LCD panel.
    As to what the most recent display firmware update did, I am doubtful that Apple will allow Brett to reveal that kind of information, but we can be hopeful.
    As far as when it will be safe to purchase a new iMac, I seriously doubt that Apple will say anything which would suggest that it is not safe to purchase a new iMac now. What company is going to say "Don't buy our product now. It's not safe"?
    For my part, I have now contacted Apple regarding the issues that I am having with my 27" iMac, and I will wait over the next few days to see how things play out. Based on the testimonies of others here, I don't expect Apple to disappoint. I have the confidence that they want to leave me a satisfied customer who will continue to purchase their products in the future.
    Message was edited by: Warren Beasley

  • Just wondering what Apple's stand is on the issue with a flickering and a dark area appearing on imac 27"screen - forums seem to indicate this is not uncommon - and happens through normal use - so should be subject to repair (Sale of Goods Act - 6 years)

    Just wondering what Apple's stand is on the issue with a flickering and a dark area appearing on imac 27"screen - forums seem to indicate this is not uncommon - and happens through normal use - so should be subject to repair (Sale of Goods Act - ie 6 year warranty)

    We are just users like yourself.  If Apple has stated publicly about the problems you mentioned, it will be listed on their website and/or in one of their Knowledge Base Articles.
    I have a 27" & do not suffer from such a problem.  You should keep in mind that these are technical support forums. Generally, the only people posting here are those with problems. The thousands/millions without problems don't ever come here. 
    Think of these forums as a hospital emergency room. 

  • Screen sharing/splitting PC laptop and 2012 IMac. How?

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  • Dirty inside Screen late 2012 imac

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  • Imac (late 2012) Block on screen

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    Hi,
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    <Edited by Host>

  • [Guide] Install and run Windows 7/8 from an external drive without using bootcamp (works for late 2012 iMacs with 3TB drive)

    This is a copy of a post from my blog, you can also Read it on my blog...
    Introduction
    After I received my new iMac with a 3 TB Fusion Drive, I was disappointed when I realized that Bootcamp was not running on this model and prevented me from installing Windows on it. I wanted to take advantage of the powerful iMac hardware to play games but I couldn't.
    There are a few ways of working around this limitation, but I found most of them quite complex and most of the time they required formatting the internal hard drive or repartitioning it and go for a brand new installation of Mac OS X. I was not comfortable with that.
    But there is another way, and that is to install Windows on an external hard drive, using either USB or Thunderbolt. Personally I used a Lacie Rugged 1 TB drive that has both USB3 and Thunderbolt connectors. Both work very well.
    This guide may interest you if:
    You have an internal hard drive of more than 2TB and you can't run bootcamp at all (like late 2012 iMacs with a 3TB drive)
    You have limited space or you don't want to dedicate disk space on your internal hard disk drive to a Windows installation
    What this guide will make you do:
    It will make you erase all your data from your external USB3/Thunderbolt hard drive
    It will make you install Windows on your external USB3/Thunderbolt hard drive
    It will make you install bootcamp drivers
    What this will not make you do:
    It will not make you modify anything on your internal Mac hard drive
    It will not make you use or install the bootcamp assistant
    It will not activate the Preference Pane for the default boot drive. You have to boot by pressing the ALT key to manually select your boot drive each tome you want to boot Windows.
    What you'll need
    An external hard drive with a USB3 and/or Thunderbolt connector. This drive will be formatted so ensure you saved your files before going further. You can use either an SSD drive or a classic hard drive.
    A Windows 7 or 8 install DVD or ISO (check whether to install 32 or 64 bits versions based on your Bootcamp drivers) and the corresponding Windows serial number.
    One of the following:
    Mac OS X with a Windows 7 or 8 Virtual Machine (use VMWare Fusion or Parallels Desktop for example. Note: VMWare Fusion seems to have some issues with Thunderbolt and USB3. Plug your drive to a USB2 enclosure or hub to work around this -it worked for me-, or use another VM software) → Read the important note below
    A PC running Windows 7 or 8 → Read the important note below
    Windows AIK (free) running on your Virtual Machine or on your PC, or just the imagex.exe file (the rest of the Windows AIK package is not needed)
    Download imagex.exe
    Download Windows AIK (this download and installation is not required if you have already downloaded imagex.exe)
    Bootcamp drivers for your Mac. You can get these either by running bootcamp from your Mac (Applications > Utilities > Bootcamp) or, if like me you have a 3TB drive and can't run bootcamp at all, use the direct download links here.
    A USB stick to store your bootcamp drivers
    IMPORTANT: If your Mac has a 64 bits processor, your Windows Virtual Machine on OSX, your Windows installation on your PC and your Windows DVD/ISO must also be in 64 bits!
    Step by Step guide
    Step 1: Get the install.wim file
    If you have a Windows ISO file:
    Mount the ISO
    If you're on OS X: double click on the ISO file
    If you're on on Windows 7: Use a software like Virtual Clone Drive (free)
    If you're on Windows 8: double click on the ISO file
    Open the mounted drive, then go to the "sources" folder and locate the "install.wim" file. Save this file to C:\wim\ on your Windows installation or virtual machine.
    If you have a Windows DVD: open the "sources" folder on the DVD and locate the "install.wim" file. Save this file to C:\wim\ on your Windows installation or virtual machine.
    IMPORTANT: If instead of a "install.wim" file, you have "install.esd", you can not continue this step by step guide. And an ESD file can not be converted into a WIM file. So you must get a version of the Windows installation DVD/ISO that has an install.wim file.
    Step 2: Clean, partition and format your external hard drive
    On your Windows installation or virtual machine, plug in your external hard drive (can be plugged using USB2, USB3 or Thunderbolt at this stage)
    Open the command prompt in administrator mode (cmd.exe). To run it in administrator mode, right click on cmd.exe > Run as admin.
    Type the following and hit enter to open the disk partitioner utility:
    diskpartType the following and hit enter to list your drives:
    list disk
    This will display a list of disks mounted on your computer or virtual machine. Make sure your drive is listed here before you continue.Identify the disk ID of your external hard drive. Replace # by your real external disk ID in the command below:
    select disk #Clean all partitions by typing the following (warning: this will erase all data from your external drive!):
    clean
    Create the boot parition by typing the following followed by the enter key:
    create partition primary size=350
    This will create a 350MB partition on your external driveFormat the partition in FAT32 by typing the following:
    format fs=fat32 quick
    Set this partition to active by typing:
    active
    Assign a letter to mount this partition. We will use letter B in our example. If B is already used on your PC, replace B by any other available letter:
    assign letter=b
    Windows will detect a new drive and probably display a pop-up. Ignore that.Create the Windows installation partition using all the remaining space available on the external drive by typing the following:
    create partition primary
    Format the new partition in NTFS:
    format fs=ntfs quick
    Assign a letter to mount this partition. We will use letter O in our example. If O is already used on your PC, replace O by any other available letter:
    assign letter=o
    Windows will detect a new drive and probably display a pop-up. Ignore that.Exit the disk partitioner utility by typing:
    exit
    Step 3: Deploy the Windows installation image
    Still using the command prompt in admin mode (you didn't close it, did you? ), locate the imagex.exe file mentioned in the "What you'll need" section and access its folder. In our example, we have put this file in C:\imagex\imagex.exe
    Type the following and hit enter (remember to replace o: with the letter you have chosen in the previous step):
    imagex.exe /apply C:\wim\install.wim 1 o:
    This will take some time. The Windows installation image is being deployed to your external driveOnce done, type the following to create the boot section (remember to replace o: and b: with the letters you've chosen in the previous step):
    o:\windows\system32\bcdboot o:\windows /f ALL /s b:
    If you get an error message saying that you can't run this program on your PC, then most probably you are running on a 32 bits installation of windows and you're trying to deploy a 64 bits install. This means you did not read the important notes in the beginning of this guide
    If you get an error message on the options that can be used with the BCDBOOT command, then it's because you're installing Windows 7, and the /f option is not supported. If that is the case, remove /f ALL from the command and retry.
    Step 4: Boot from your external drive and install Windows
    Plug in your external drive:
    If you've done all the previous steps from a Windows PC, unplug your external drive from your PC and plug it to your Mac, either on a USB3 or a Thunderbolt port.
    If you've done all the previous steps from your Mac using a Virtual Machine, ensure the external drive is plugged in to a USB3 or Thunderbolt port. Using USB2 should also work but you'll get very poor performance so I don't recommend doing that.
    Reboot your Mac and once the bootup sound is over, immediately press the ALT (option) key and release it only when the boot drives selection screen appears. If you did not get the boot drives selection screen, reboot and try again. The timing to press the ALT (option) key is quite short. It must not be too early or too late.
    On the boot selection screen, choose "Windows" using the arrow keys on your keyboard, then press enter.
    The Windows installation starts. Follow the on-screen instructions as normal. The installation program will restart your computer one or 2 times. Don't forget to press ALT (option) right after the bootup sound, and boot on Windows again each time to continue the installation.
    Step 5: Install bootcamp drivers
    Once the Windows installation is complete, plug in the USB stick where you stored the bootcamp drivers (see "what you'll need" section), open it and right click on "setup.exe" and select "Run as admin". Follow the on-screen instructions.If you have an error saying that you can't run this program on this PC, obviously you have installed a 32 bits version of Windows and the bootcamp drivers for your Mac are made for a 64 bits version. You have to restart the whole guide and make sure to get a 64 bits version of Windows this time!
    Once the bootcamp drivers are all installed, reboot and press ALT (option) after the bootup sound to boot on Windows again. And Voilà, you have Windows installed on your USB3/Thunderbolt drive running on your Mac.
    Now each time you want to boot on Windows, press and hold the ALT (option) key after the startup sound and select "Windows", then press Enter.

    Hi i'm trying to follow your guide, I installed windows 8 on bootcamp to do it planning to remove it after the operation is done, but i get stuck at part 3: every command i give to imagex i get a pop-up ftom windws asking how do I want to open this kind of file install.wim and imagex does nothing, what do i have to do to stop those pop-ups?

  • 2012 iMac 27" fails to boot AND wake from sleep

    Hi all,
    My 2012 iMac has recently started giving my trouble when booting and waking from sleep.
    When booting - A normal power up results in the apple logo screen being stuck, then I have to hold down the power button for a few seconds until power off, then i power it back up and the computer boots up normally. NOTE: only at the second time does the computer succeed in getting past the apple logo screen to the sign in screen.
    Waking from Sleep - When ever the mac goes to sleep he doesn’t seem to be able to wake up. Usually stuck on a black screen with just the spinning wheel shown. At times i waited more then an hour to see if he can get passed the black screen but in vain.
    Other then that the mac works fine.
    Both issues started roughly two weeks ago and roughly at the same time.
    My mac is mostly used for work, I'm familiar with computers so I am trying to be extra careful with installing weird applications but you could never know..
    SPEC:
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    16GB RAM.
    1TB Fusion drive.
    2GB NVIDIA GTX 680MX
    Wired keyboard and a Magic mouse.
    Mountain Lion 10.8.5 (Updated and backed up on a regular basis)
    Things I've tried:
    Boot to Recovery and Repair Disk/Permissions.
    Safe Boot.
    SMC reset.
    PRAM reset.
    * The first two produced a single case of a normal start up, but after a shut down the problem remains.
    Any ideas/thoughts/help would be much appriciated,
    Thanks in advance,
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    Bump.

  • Late 2012 iMac Freezes every few days

    My iMac has been in the Apple Store for a week with the Geniuses and they came back saying they couldn't find anything so putting this out to this community in the hope someone else can help. Here are the details.
    Model: 21.5 inch Late-2012 iMac
    RAM: 8Gb
    Processor: 2.9Ghz Intel Core i5
    Graphics: NVIDIA GeForce GT 650M 512 MB
    Hard Drive: 1.12 Tb Fusion (653Gb free)
    OS: 10.8.4
    Software: Fairly vanilla with no MS or Adobe Apps. No system extensions or hacks installed.
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    Solutions Tried:
    - Fixed permissions
    - Reset PRAM
    - Re-install OS X
    I can't replicate the crash but today it happened again. At around 3:50pm I went to the iMac and noticed that Pages wouldn't load. Force quitting the App didn't do anything. Aperture was not responding so force quit that. Still wouldn't re-open. Mail was working fine and I was able to send a test message. Safari worked fine. Launched System Preferences ok but could not launch TextEdit or App Store. Calendar opened and closed fine. Attempted to restart the Mac but got the grey screen and after 5 minutes of waiting turned the computer off & relaunched it.
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    5/09/13 2:27:41.316 PM coreaudiod[122]: Enabled automatic stack shots because audio IO is inactive
    5/09/13 2:28:16.449 PM coreaudiod[122]: Disabled automatic stack shots because audio IO is active
    5/09/13 2:28:17.262 PM coreaudiod[122]: Enabled automatic stack shots because audio IO is inactive
    5/09/13 2:28:50.579 PM com.apple.usbmuxd[68]: _heartbeat_failed heartbeat detected detach for device 0xdf3-10.0.1.10:0!
    5/09/13 2:37:54.690 PM com.apple.usbmuxd[68]: _heartbeat_failed heartbeat detected detach for device 0xdfc-10.0.1.10:0!
    5/09/13 2:42:04.656 PM lsboxd[209]: @AE relay 61657674:6f646f63
    5/09/13 2:47:21.156 PM com.apple.usbmuxd[68]: _heartbeat_failed heartbeat detected detach for device 0xe05-10.0.1.11:0!
    5/09/13 4:03:23.428 PM com.apple.launchd[1]: *** launchd[1] has started up. ***
    5/09/13 4:03:23.428 PM com.apple.launchd[1]: *** Shutdown logging is enabled. ***
    5/09/13 4:03:24.934 PM com.apple.launchd[1]: (com.apple.automountd) Unknown key for boolean: NSSupportsSuddenTermination
    5/09/13 4:03:26.157 PM airportd[30]: _processDLILEvent: en1 attached (down)
    5/09/13 4:03:26.342 PM UserEventAgent[11]: Captive: [HandleNetworkInformationChanged:2435] nwi_state_copy returned NULL
    5/09/13 4:03:26.609 PM fseventsd[39]: event logs in /.fseventsd out of sync with volume.  destroying old logs. (419745 5 419906)
    5/09/13 4:03:26.612 PM fseventsd[39]: log dir: /.fseventsd getting new uuid: A3689432-84D2-4FB0-8C25-0352BC004F8B
    5/09/13 4:03:26.666 PM mDNSResponder[40]: mDNSResponder mDNSResponder-379.38.1 (Apr 25 2013 19:19:56) starting OSXVers 12
    Notice that the last Console entry was at 2:47pm (in red) and then nothing. I went to use the computer at 3:50pm and did several actions on it. Plugged in iPad, opened iTunes. Copied a file from the iPad to the desktop. Prior to that it hadn't been used for several hours. The shutdown that I selected does not appear in the log (although it only managed to go to the grey screen rather than complete a full shut down).
    Appreciate any clues at all here. This is very frustrating and has been going on for far too long.
    TIA. Jordan

    Back up all data immediately as your boot drive may be failing.
    If you have more than one user account, these instructions must be carried out as an administrator.
    Triple-click anywhere in the line below on this page to select it:
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    Copy the selected text to the Clipboard (command-C).
    Launch the Terminal application in any of the following ways:
    ☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
    ☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
    ☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
    Paste into the Terminal window (command-V).
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  • Can 2012 iMac be used as monitor for PC with thunderbolt?

    Hi,
    Im planning on buying a new 2012 iMac and was wondering about TDM - Target Display Mode.
    My PC rig is up for a new motherboard and the thought was to buy a thunderbolt equipped one and then use my shiny new iMac as display for it.
    That way I can switch between them easily and only use the one screen. I know Apple support pages tell you that any thunderbolt equipped mac can use the iMac in TDM but what about a Windows PC with thunderbolt motherboard?
    Any help is appreciated!

    Lulus_Dad wrote:
    You might try using the Parallels software program that enables Windoze to be run on a Mac; that way you could eliminate a second keyboard too. But then, if you had Parallels runing on your Mac the PC would be totally and utterly superflous since you could just load all of your PC stuff into a sub-directory on the Mac HD. It'd run better too.
    That is fine If he has a Non Branded install of Windows on his PC. In other words a Retail copy of Windows installed on his PC. None of the Virtual Machine programs let you import a Branded installl of Windows. That is Totally against the license terms. When I say Branded I mean a version that came with the PC from makers like Dell, HP, Sony and the like. Those versions are for those specific brand of PCs and can Not be moved or installed on other hardware, virtual or physical.
    And to your comment that it will run better on a Mac is just completely false. No OS runs better in a Virtual Machine then it does on it own set of physical hardware. Not only that but if you use Boot Camp to install Windows on it own partition on the Mac the Mac still has limiting factor invovled that are not present when running on Real Windows PC hardware.

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