I have a late 2009 imac i am having issues with my screen flickering and getting dark

i have a late 2009 imac  21 inch i am having problems with my screen flickering ND GETTING DARK DOES THIS MEAN THAT MY COMPUTER IA FAILING

I have partly the same problem (Sceen blackening) sparodically.
2010 iMAC  with I7 CPU and ATI Radeon HD 4850 512 MB Graphics.
If I lower the brightness to around (3 or sometimes 4 of the on screen squares F2) the issue does not happen at all. I prefer a bright screen.
The issue commenced immediately after instaalling OS X 10.8.2 update one year ago.
The current software is  OS X 10.9 (13A603)
The graphics on this computer are always first rate when working properly even at maximum brightness
There are particular days and times when the problem routinely occurs.
Some of my neighbors with iMacs have similar problems.
I live adjacent to the City of London in an area where new building seems to be developing faster than the various utilities and there are known Power Network issues. Professional surge supressors make no difference.
I live in a large property with four independent ring mais. The issue is present on all four rings. I have yet to take the computer elsewhere to possibly eliminate power issues from the problem.
I am reluctant to replace an otherwise fine top of range iMac which otherwise serves me well since the same problems might be present.

Similar Messages

  • Ok here goes nothing i have a late 2009 iMac 27  11.1 intel bought it refurbished and they installed mountain lion 10.8.4 on delivery w/o disks i think ran lion orig. idk & its been all problems 10.8.5 M.L so tried Maverick 10.9 now worse please help me

    ok here goes nothing i have a late 2009 iMac 27  11.1 intel bought it refurbished and they installed mountain lion 10.8.4 on delivery w/o disks i think ran lion orig. idk & its been all problems 10.8.5 M.L so tried Maverick 10.9 now worse please help me.....i still have backups of software for mountain lion 10.8 however i need to throw everything on a usb toshiba 1TB external storage for backup, plus from what ive read being i needed to try to go back and update the efi and frimware for my original model but when i found the right one it wont accept it.....and now i just tried to reinstall my mountain lion probably shoud have left in the cloud til i got backed up ...which i now needed to move my previous backed up stuff off the drive to reformat it properly as i read it being toshiba needs to be guid hard drive mac im relatively new to the whole mac thing and im just as ****** off as i was with PC ....lol i just wanna record music and have a steady workflow i do have a new 4s iphone and cloud storage but i believe my computers hacked or got malware or just ****** from incompatiable software ......and keychains not working for admin either PLEASE tell ,me what to do thx .....i will be so grateful im good with recording software and stuff bad with computers programing lol HELP me

    Hardware Overview:
      Model Name:          iMac
      Model Identifier:          iMac11,1
      Processor Name:          Intel Core i7
      Processor Speed:          2.8 GHz
      Number of Processors:          1
      Total Number of Cores:          4
      L2 Cache (per Core):          256 KB
      L3 Cache:          8 MB
      Memory:          16 GB
      Processor Interconnect Speed:          4.8 GT/s
      Boot ROM Version:          IM111.0034.B02
      SMC Version (system):          1.54f36
    Message was edited by: lnwko

  • I have a late 2009 iMac. I installed OSX 10.8.4 and want to go back to Snow Leopard. I have a 1.5TB external HD. Are there any issues I need to know about or tips I need to know before doing this? Thanks.

    I have a late 2009 iMac. I installed OSX 10.8.4 and want to go back to Snow Leopard. I have a 3TB external HD. Are there any issues I need to know about or tips I need to know before doing this? Thanks.

    Downgrade Lion/Mountain Lion to Snow Leopard
      1. Boot from your Snow Leopard Installer Disc. After the installer
          loads select your language and click on the Continue
          button. When the menu bar appears select Disk Utility from the
          Utilities menu.
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          mfgr.'s ID and size) from the left side list. Note the SMART status
          of the drive in DU's status area.  If it does not say "Verified" then
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      3. Under the Volume Scheme heading set the number of partitions
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      4. Quit DU and return to the installer. Install Snow Leopard.
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    If you have Snow Leopard Time Machine backups made while on Snow Leopard, then you may do a full system restore per #14 in Time Machine - Frequently Asked Questions.  If you have subsequent backups from Lion, you can restore newer items selectively, via the "Star Wars" display, per #15 there, but be careful; some Snow Leopard apps may not work with the Lion/Mountain Lion files.

  • I have a late 2009 iMac, with a Nvidia 9400 Graphics card.  I was wondering what my options are for upgrading.  I use Windows 7 via Bootcamp, so I need a card that is compatible.

    I have a late 2009 iMac, with the default Nvidia 9400 Graphics card.
    I was wondering what my options are for upgrading.  I use Windows 7 via Bootcamp, so I need a card that is compatible/has available drivers.
    This is for gaming. On the lowest settings of "Call of Duty 4", I get about 100 FPS... Was hoping to be able to play on higher resolution w/o the fps lag.
    I'm not good with the hardware part of computers at all, but know how to get around the OS.

    In most cases the graphics cards in iMacs are Not upgradeable.  They are usually soldered to the logic board.  RAM is considered, along with harddrives, the only component that is upgradeable in an iMac, unlike in PC's.  So basically you would need to sell your unit and purchase an iMac with a more powerful graphics card.
    Hope this helps

  • I have a late 2009 iMac with 2.66 Ghz process, or 4GB 1067 MHz DDR3, can I upgrade to Mountain Lion?

    have a late 2009 iMac with 2.66 Ghz process, or 4GB 1067 MHz DDR3, can I upgrade to Mountain Lion?

    You can upgrade to OS X Mountain Lion and Mavericks. I recommend you to upgrade to OS X Mavericks because it is the most recent version and it is free.
    Open the Mac App Store and download OS X Mavericks for free. While it's being downloaded, make a backup of your files with Time Machine and check that your apps are supported > http://www.roaringapps.com
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  • HT4759 If I have a late 2006 iMac is there any way to sync my contacts and calendar with my iphone

    If I have a late 2006 iMac is there any way to sync my contacts and calendar with my iphone

    Upgrade to 10.7.5. See:
    Upgrading to Lion
    If your computer does not meet the requirements to install Mountain Lion, it may still meet the requirements to install Lion.
    You can purchase Lion by contacting Customer Service: Contacting Apple for support and service - this includes international calling numbers. The cost is $19.99 (as it was before) plus tax.  It's a download. You will get an email containing a redemption code that you then use at the Mac App Store to download Lion. Save a copy of that installer to your Downloads folder because the installer deletes itself at the end of the installation.
         Lion System Requirements
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               or Xeon processor
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           3. OS X v10.6.6 or later (v10.6.8 recommended)
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           5. Some features require an Apple ID; terms apply.

  • I have been having issues with not receiving texts and voicemails daily, for a few months now. If I turn the phone completely off, when I turn it back on the messages will flood in from hours before. I can't be continually turning off my phone in case som

    I have been having issues with not receiving texts and voicemails daily, for a few months now. If I turn the phone completely off, when I turn it back on the messages will flood in from hours before. I can't be continually turning off my phone in case someone left me a message. How do I resolve this issue?

    Wifi:  my Cell phone will remember 10 wifi connections.  So delete any you don't use often and your home wifi and try to enter home wifi again.
    if it still won't connect to home wifi, call your internet provider for help.  You may need a newer router or different settings Or upgraded service.   Your phone seeks the best connection and will refuse lesser connections.
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    if still not fixed, go back to apple and insist on repair or replacement.
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  • |HELP| Is the late 2009 iMac going to work fine with Video Editing ?

    Hey guys,
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    Intel Quad-Core i7 2,8 GHz
    ATI Radeon HD 4850 512MB
    4GB DDR3
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    Thank you very much.

    Your system could use more RAM. However, it should run fine if you quit all other Apps and have plenty of free internal hard drive space.
    For quality RAM upgrades, go to > OWC Macsales.com or Crucial.com

  • How can I use my Late 2009 iMac as an external monitor with my new MacBook Pro 15" Retina

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    Thanks!

    Hello, All-
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  • I have a issue with my screen now and then it shows colored pixels all over the screen

    is started somw days ago i didnt do any software update but when i change webpages or apps on the desktop thise pixels come out it's like small squares colored and they go away after a few seconds. what can it be? maybe some issues with the video card?

    I have this as well.  imac i7.  Not sure if its hardware (video card) or software related.  Does it look like this?

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    Is this problem affecting most users? I heard that it usually takes abotu 2-3 weeks after getting a replacement that these problems might occur and I don't wanna shell out a lot of money only to have to constantly go to the apple store and get a new replacement regardless if it is free.

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  • I have a MacBook Pro Late 2011 and having issues with utilities screen.

    I have a MacBook Pro Late 2011. I want to reformat my hdd to start from scratch. My issue is when I am on the utilities screen I am unable to click on anything. I want to delete my current partition but I am unable to click on Disk Utilities. Please help me!

    According to your profile your Mac is running v10.7.3 Lion.
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  • Should I do a clean install of Mountain Lion on a late 2009 iMac or will I find hardware/driver issues?

    I have a late 2009 iMac (2.93 Ghz Intel Core Duo, 4GB of ram, model id is 9.1) running Lion right now. I upgraded it all the way from Leopard using the standard keep-all-your-apps-and-settings way. After looking at the hardware requirements for Mountain Lion (and my success with running Lion) it seems that my good ol' iMac is still capable of running it fairly well. But I don't like the idea of "stacking" upgrade after upgrade (*coughs*, clean freak!). I like the idea of starting out clean this time because so many years of use has filled my mac with a lot of crap I no longer use.
    So I would like to know your sane advice, and if there's anything I should check out before attempting this. Especially I'm concerned about hardware/driver related issues like for example: the webcam or speakers no longer working. Also, if there's something I'm overlooking please point it out.
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    If it wasn't a Mac computer that originally came with either Lion or Mt Lion Pre-Installed by Apple when new you would not be able to connect to the Online Internet Recovery system. It is a Feature of the Mac EFI Firmware system. And it will only install whichever version of the Download only version of OS X that originally came on that system.
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    It is something different, but not completely different, from the built in Recovery HD partition on the internal drive.
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  • Late 2009 iMac running sporadically slow

    Hi I was wondering if anyone could help
    I have a late 2009 iMac with 4gb of Ram which is running intermittently slow and hanging. It has periods when it works fine and then others where the icons bounce for ages before opening and the little spinning circles arrive when even doing the most basic of activities. I don't have hundreds of things open at once.
    Its hardwired to the network so even if streaming iCloud music it shouldn't really cause the system to hang.
    Its upgraded to Yosemite, but these issues were pre-exisiting and its been slow for a while.
    Use dropbox and appreciate big syncs will have an issue, but at the moment that is all up to date.
    Below is a system report and:
    EtreCheck version: 2.0.11 (98)
    Report generated 7 November 2014 11:46:42 GMT
    Hardware Information: ℹ️
      iMac (21.5-inch, Late 2009) (Verified)
      iMac - model: iMac10,1
      1 3.06 GHz Intel Core 2 Duo CPU: 2-core
      4 GB RAM Upgradeable
      BANK 0/DIMM0
      empty empty empty empty
      BANK 1/DIMM0
      empty empty empty empty
      BANK 0/DIMM1
      2 GB DDR3 1067 MHz ok
      BANK 1/DIMM1
      2 GB DDR3 1067 MHz ok
      Bluetooth: Old - Handoff/Airdrop2 not supported
      Wireless:  en1: 802.11 a/b/g/n
    Video Information: ℹ️
      NVIDIA GeForce 9400 - VRAM: 256 MB
      iMac 1920 x 1080
    System Software: ℹ️
      OS X 10.10 (14A389) - Uptime: 8 days 1:59:54
    Disk Information: ℹ️
      WDC WD5000AAKS-40V2B0 disk0 : (500.11 GB)
      S.M.A.R.T. Status: Verified
      EFI (disk0s1) <not mounted> : 210 MB
      Macintosh HD (disk0s2) /  [Startup]: 499.25 GB (272.34 GB free)
      Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
      OPTIARC DVD RW AD-5680H
    USB Information: ℹ️
      Apple Inc. Built-in iSight
      Apple Internal Memory Card Reader
      Apple Computer, Inc. IR Receiver
      Apple Inc. BRCM2046 Hub
      Apple Inc. Bluetooth USB Host Controller
    Gatekeeper: ℹ️
      Mac App Store and identified developers
    Kernel Extensions: ℹ️
      /Library/Application Support/LogMeIn/drivers
      [not loaded] com.logmein.driver.LogMeInSoundDriver (4.1.46f67) Support
      /Library/Extensions
      [not loaded] org.virtualbox.kext.VBoxDrv (4.2.6) Support
      [not loaded] org.virtualbox.kext.VBoxNetAdp (4.2.6) Support
      [not loaded] org.virtualbox.kext.VBoxNetFlt (4.2.6) Support
      [not loaded] org.virtualbox.kext.VBoxUSB (4.2.6) Support
      /System/Library/Extensions
      [not loaded] com.FTDI.driver.FTDIUSBSerialDriver (2.2.14) Support
      [not loaded] com.MCCI.SLAB_USBtoUART (1.02.0f2) Support
      [not loaded] com.aliph.driver.jstub (1.1.2 - SDK 10.7) Support
      [not loaded] com.bodymedia.codelessAB185.kext (1) Support
      [not loaded] com.motorola-mobility.driver.MotMobileUSB (1.2.2 - SDK 10.5) Support
      /System/Library/Extensions/MotMobileUSB.kext/Contents/PlugIns
      [not loaded] com.motorola-mobility.driver.MotMobileMS (1.0.0 - SDK 10.5) Support
      [not loaded] com.motorola-mobility.driver.MotMobileMTP (1.2.2 - SDK 10.5) Support
      [not loaded] com.motorola-mobility.driver.MotMobileUSBLAN (1.2.2 - SDK 10.5) Support
      [not loaded] com.motorola-mobility.driver.MotMobileUSBLANMerge (1.2.2 - SDK 10.5) Support
      [not loaded] com.motorola-mobility.driver.MotMobileUSBSwch (1.2.2 - SDK 10.5) Support
    Startup Items: ℹ️
      VirtualBox: Path: /Library/StartupItems/VirtualBox
      Startup items are obsolete and will not work in future versions of OS X
    Problem System Launch Agents: ℹ️
      [failed] com.apple.AirPlayUIAgent.plist
      [failed] com.apple.CallHistoryPluginHelper.plist
      [failed] com.apple.cmfsyncagent.plist
      [failed] com.apple.EscrowSecurityAlert.plist
      [failed] com.apple.scopedbookmarkagent.xpc.plist
      [failed] com.apple.telephonyutilities.callservicesd.plist
    Problem System Launch Daemons: ℹ️
      [failed] com.apple.ctkd.plist
      [failed] com.apple.icloud.findmydeviced.plist
      [failed] com.apple.ifdreader.plist
      [failed] com.apple.nehelper.plist
      [failed] com.apple.periodic-daily.plist
      [failed] com.apple.periodic-monthly.plist
      [failed] com.apple.periodic-weekly.plist
      [failed] com.apple.wdhelper.plist
    Launch Agents: ℹ️
      [not loaded] com.adobe.AAM.Updater-1.0.plist Support
      [running] com.conduit.loader.agent.plist Support
      [running] com.hp.devicemonitor.plist Support
      [loaded] com.hp.help.tocgenerator.plist Support
      [loaded] com.hp.messagecenter.launcher.plist Support
      [running] com.logmein.logmeingui.plist Support
      [running] com.logmein.logmeinguiagent.plist Support
      [not loaded] com.logmein.logmeinguiagentatlogin.plist Support
      [loaded] com.motorola.MDMUpdater.plist Support
      [running] com.motorola.motohelper.plist Support
      [loaded] com.motorola.motohelperUpdater.plist Support
      [running] jp.co.canon.CUPSCAPT.BG.plist Support
      [running] jp.co.canon.CUPSPS2.BG.plist Support
    Launch Daemons: ℹ️
      [loaded] com.adobe.fpsaud.plist Support
      [running] com.hp.mss.clientService.plist Support
      [running] com.hp.mss.VDProxy.plist Support
      [running] com.icyblaze.iDocumentHelper.plist Support
      [running] com.logmein.logmeinserver.plist Support
      [invalid?] com.logmein.raupdate.plist Support
      [loaded] com.microsoft.office.licensing.helper.plist Support
      [invalid?] com.motorola-mobility.mmcfgd.plist Support
      [invalid?] com.sonos.smbbump.plist Support
    User Launch Agents: ℹ️
      [loaded] com.adobe.AAM.Updater-1.0.plist Support
      [loaded] com.adobe.ARM.[...].plist Support
      [running] com.akamai.single-user-client.plist Support
      [invalid?] com.google.GoogleContactSyncAgent.plist Support
      [loaded] com.google.keystone.agent.plist Support
      [running] com.spotify.webhelper.plist Support
      [invalid?] org.virtualbox.vboxwebsrv.plist Support
    User Login Items: ℹ️
      ScanSnap Manager Application (/Applications/ScanSnap/ScanSnap Manager.app)
      Dropbox Application (/Applications/Dropbox.app)
      FlowSync Application (/Applications/FlowSync.app)
    Internet Plug-ins: ℹ️
      SkyCaddiePlugIn: Version: 1.02 Support
      Unity Web Player: Version: UnityPlayer version 2.6.1f3 Support
      Default Browser: Version: 600 - SDK 10.10
      AmazonMP3DownloaderPlugin1016264: Version: AmazonMP3DownloaderPlugin 1.0.17 - SDK 10.4 Support
      NP2020Player: Version: 5.0.4.0 Support
      AdobePDFViewerNPAPI: Version: 10.1.12 Support
      FlashPlayer-10.6: Version: 15.0.0.189 - SDK 10.6 Support
      LogMeIn: Version: 1.0.935 - SDK 10.7 Support
      AmazonMP3DownloaderPlugin101749: Version: AmazonMP3DownloaderPlugin 1.0.17 - SDK 10.4 Support
      Flash Player: Version: 15.0.0.189 - SDK 10.6 Support
      LogMeInSafari32: Version: 1.0.935 - SDK 10.7 Support
      iPhotoPhotocast: Version: 7.0
      QuickTime Plugin: Version: 7.7.3
      AdobePDFViewer: Version: 10.1.12 Support
      SharePointBrowserPlugin: Version: 14.0.1 Support
      Silverlight: Version: 5.0.61118.0 - SDK 10.6 Support
      hpHomeClient: Version: 1.0 Support
      JavaAppletPlugin: Version: 15.0.0 - SDK 10.10 Check version
    User Internet Plug-ins: ℹ️
      WebEx64: Version: 1.0 - SDK 10.6 Support
    3rd Party Preference Panes: ℹ️
      Flash Player  Support
      Growl  Support
      MusicManager  Support
    Time Machine: ℹ️
      Skip System Files: NO
      Mobile backups: OFF
      Auto backup: YES
      Volumes being backed up:
      Macintosh HD: Disk size: 499.25 GB Disk used: 226.91 GB
      Destinations:
      My Book [Local]
      Total size: 0 B
      Total number of backups: 0
      Oldest backup: -
      Last backup: -
      Size of backup disk: Too small
      Backup size 0 B < (Disk used 226.91 GB X 3)
    Top Processes by CPU: ℹ️
          8% Mail
          3% com.apple.InputMethodKit.UserDictionary
          2% coreaudiod
          2% WindowServer
          1% bird
    Top Processes by Memory: ℹ️
      172 MB Mail
      137 MB iTunes
      107 MB WindowServer
      103 MB com.apple.WebKit.WebContent
      82 MB Microsoft Word
    Virtual Memory Information: ℹ️
      51 MB Free RAM
      1.09 GB Active RAM
      1.04 GB Inactive RAM
      766 MB Wired RAM
      48.33 GB Page-ins
      1.65 GB Page-outs

    When you have the problem, note the exact time: hour, minute, second.  
    These instructions must be carried out as an administrator. If you have only one user account, you are the administrator.
    Launch the Console 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 Console in the icon grid.
    The title of the Console window should be All Messages. If it isn't, select
              SYSTEM LOG QUERIES ▹ All Messages
    from the log list on the left. If you don't see that list, select
              View ▹ Show Log List
    from the menu bar at the top of the screen.
    Each message in the log begins with the date and time when it was entered. Scroll back to the time you noted above.
    Select the messages entered from then until the end of the episode, or until they start to repeat, whichever comes first.
    Copy the messages to the Clipboard by pressing the key combination command-C. Paste into a reply to this message by pressing command-V.
    The log contains a vast amount of information, almost all of it useless for solving any particular problem. When posting a log extract, be selective. A few dozen lines are almost always more than enough.
    Please don't indiscriminately dump thousands of lines from the log into this discussion.
    Please don't post screenshots of log messages—post the text.
    Some private information, such as your name, may appear in the log. Anonymize before posting.

  • Late 2009 imac as second display for new (late 2012) imac. How to?

    I have a late 2009 imac 27 that I would like to use as a second display for my late 2012 imac 27. Has anybody connected them successfully? I am getting very mixed information on the topic.

    Thank you. Here's where my confusion comes in
    "iMac (Mid 2011) and later: target Display Mode does not work with Mini DisplayPort cable"
    Symptoms
    When you attempt to connect an iMac (21.5-inch or 27-inch, Mid 2011) and later to another computer with a Mini DisplayPort to Mini DisplayPort cable, the screen of the target iMac will not become an external display when you press Command-F2 to activate Target Display Mode.
    Resolution
    iMac (21.5-inch, Mid 2011) and iMac (27-inch, Mid 2011) and later computers support Target Display Mode via Thunderbolt to Thunderbolt cable (2 m) when the source is another Thunderbolt-equipped computer.
    iMac (27-inch, Mid 2011) computers do not support Target Display Mode via Mini DisplayPort cables.

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