I have weird pixelly artefacts showing on my screen...

Can anyone tell me what is going on with my iMac?
I have weird pixelly artefacts showing on my screen.
The attached picture shows a particularly bad portion of a screen grab of this, taken in Safari whilst browsing a website.
The lines and blocks flicker like crazy. They're not moving around, and where they appear, they stay flickering in that spot – BUT if I move the browser window, then weirdly the flickering lines and blocks follow along with the window.
If I flip to a different application, then the flickering lines and blocks might move to a different location, or they might disappear altogether, or there might be more of them or there might be less of them. It's all very random.
Also, as you can see, for some reason I have lines appearing over a dark section where there is an image, and I have blocks appearing over a light section where there is no image.
It can be seen in any application, be it Safari, the Finder, Photoshop, anything...
Some days it's a little bit, some days it's a crazy amount. It usually disappears totally after a reboot, but then after restarting, the flickering lines and blocks gradually appear over time.
Any help appreciated. Thanks.
Running 10.9.3 on a 2.7GHz i5 iMac.

See if your mid 2007 27" iMac meets the requirements for this graphic card recall: iMac (27-inch): AMD Radeon 6970M Video Card Replacement Program - Apple Support
If it does make an appointment at the nearest Apple Genius Bar and take the iMac in.

Similar Messages

  • I have a small lock showing on my screen and when I turn the phone sideways the screen will not turn. How do I unlock the scree ?

    I have a small lock showing on the top of my screen on my iphone 4 and when I turn the phone sideways the screen will not turn with it. How do I unlock this

    http://www.iphonefaq.org/archives/97974
    Also available with the iPhone user guide.

  • I have weird looking white lines on my screen

    Greetings guys,
    Everytime I unlock my iPod Touch 4G it has some weird horizontal white lines and the screen in all washed out.
    I have to press the lock button again and than bring it up again.
    Do you know a good solution ?
    Thanks,
    Rebecca

    Try the standard fixes:
    - Reset. Nothing will be lost.
    Reset iPod touch:  Hold down the On/Off button and the Home button at the same time for at
    least ten seconds, until the Apple logo appears.
    - Restore from backup
    - Restore to factory defaults/new iPod.

  • Help ! no longer have a tool bar showing on my screen adn therefore cannot print. How do I reshow my toolbar?

    the upper left hand corner of my screen does not show a tool bar with ...file....edit... etc. I cannot print because of this and would like to know how to refind or reshow the toolbar. thank you

    Hi debsnow,
    You should take a look at the Knowledge Base article [[Menu bar is missing]]. This should give you all the information you need to get your buttons back!
    Hopefully this helps!

  • My iPod touch will not turn on.  I only have an apple icon showing on the screen.

    My touch is only showing an apple icon.  Will not do anything else. 

    Try:
    - iOS: Not responding or does not turn on
    - Also try DFU mode after try recovery mode
    How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
    - If not successful and you can't fully turn the iOS device fully off, let the battery fully drain. After charging for an least an hour try the above again.
    - If still not successful that usually indicates a hardware problem and an appointment at the Genius Bar of an Apple store is in order.
    Apple Retail Store - Genius Bar       

  • Weird graphical artefacts -- black squares

    Hi all,
    I've got this weird graphics artefact that I sometimes see on my MBPro17. It's hard to describe, so I made a screenshot:
    http://jfouhy.googlepages.com/mac-graphics-bug.jpg
    (ignore the slight fuzzyness; that's just jpeg compression)
    In this case, the boxes are black, but they're often red, or sometimes other colours. It only happens when I'm getting the graphics card to do something "difficult", eg expose with 100+ windows, 3d application (particularly if the 3d app doesn't have focus).
    Anyone seen this before, or know what to do?

    Yay artifacts rule
    Through my experiences with artifacts I found out that it was a faulty graphics card. This was on a windows machine, so it could be a whole nother ball park with a Mac.
    So maybe call Apple or go into an Apple Store and see what they can do fer ya

  • Possible to Have ToC Default to Show Only Top Level (collapse sublevels)?

    Howdy!
    I'll bet I'm not the only one wishing for this.  Let's say you're using Captivate 4's Table of Contents feature with a longish movie of Cp slides, which is chunked into bite-size sections content-wise.  In the ToC, though, you can't mimic that same organization scheme; at least, the learner would first need to collapse all the ToC folders you've created so they see only the top-level listing.
    This can be a critical issue:  keeping the at-first-glance list in the ToC brief enough to be inviting to learners, yet allowing learners to drive which details are currently visible.
    A movie's topical hierarchy could be along these lines, for example ...
    Section 1 - National Brands
    What are National Brands?
    Why Are They Important to Our Business?
    Working with Nat. Brands
    Practice Your Knowledge
    Section 2 - International Brands
    What are International Brands?
    Why Are They Important to Our Business?
    Working with Intl. Brands
    Practice Your Knowledge
    You'd like to organize the ToC to show only the section titles (1st level) and to suppress the 2nd-level detail (slide titles) until the learner chooses to expand the folder to see those details.
    I've tried things like grouping the slides into sections in the Storyboard view and organizing the slides into sections strictly within the ToC -- both to no avail.
    Has anyone solved for this need yet?
    I'm all ears, and you'd be doing learners of the world a huge favor.
    Thanks!

    Hi, Jim.
    Thanks for being 'on the case' and looking into this so quickly.  Your
    findings are encouraging, although my user base is generally working with
    IE 6 and FP8 or 9.
    Since the only thing I may influence is getting  IT to help push out FP10,
    I'm hoping it's more of a player- than a browser-version issue.
    I'll test things out by Monday and let you know the results.  Wish me luck!
    Dave
                                                                                    From:       Jim Leichliter <[email protected]>                                                                               
    To:         Dave Tressler <[email protected]>                                                                               
    Date:       03/26/2010 06:02 PM                                                                               
    Subject:    Possible to Have ToC Default to Show Only Top Level (collapse
                  sublevels)?                                                                                
    Dave,
    I just tested this on my local web server and it worked fine.  I created a
    blank project with 8 slides.  Created my TOC with grouping... 2 slides in
    each group.  I turned on self paced learning.  I tried with and without the
    widget and it picked up where I left off in either case.  See
    https://docs.google.com/leaf?id=0B86WuEq6SVwRNWIwMjhjODctMjE2Yy00MWE2LWI5YzEtMGQxYzNjOWQ0Z mI2&hl=en. 
    I published using FP10 and IE8 to view.  Notice any difference between
    your project and this one?
    Thanks,
    Jim Leichliter

  • Do we have standard report to show sale order stock with amount?

    Do we have standard report to show sale order stock with amount?
    I try to use MB5B and MBBS but they don't show value.
    MB5B show only qty
    MBBS no any report.
    Please kindly help.
    Thank you very much.

    Okay Thank you very much for your suggestion.
    I think I have to create a new ZProgram. T_T

  • Hi, I dropped my i-phone 4 down the toilet 6 days ago and have left it in rice to dry out.  When i try turning it on there is no power.  I connected to charger and the apple sign appears.  After a while it shows iOS6 on screen and then asks me to connect

    Hi, I dropped my i-phone 4 down the toilet 6 days ago and have left it in rice to dry out.  When i try turning it on there is no power.  I connected to charger and the apple sign appears.  After a while it shows iOS6 on screen and then asks me to connect to i-tunes however my i-phone does not appear on i-tunes.  Can you advise me what to do next?

    Make an appointment at the genius bar and take your credit card. An out of warranty replacement is $199 for a 4S, $149 for a 4.

  • HT201322 itunes 11.0.3 - in my iTunes library I can no longer see purchased TV shows and Movies that are not downloaded to my computer. also In my Itunes account i have no hidden TV shows or Movies

    I'm running itunes 11.0.3 -
    in my iTunes library I can no longer see purchased TV shows and Movies that are not downloaded to my computer.
    In my Itunes account i have no hidden TV shows or Movies
    I used to be able to view all cloud and downloaded content.  I no longer can.

    There used to be option to show items that are in the cloud in your library, but I can't find where that now is (unless it's been removed). You should be able to see what items that you can re-download via the Purchased link under Quicklinks on the right-hand side of the iTunes store home page (at the top right of that there should be a 'not on this computer' button)
    Edit : Just seen your reply, though I don't appear to have that setting on mine.

  • In iTunes 11.0.2.26, an Albums search by track names returns albums as if they only have one track on them, but I still want to access the entire album. How can I have the search results show the entire album (with just the searched for name highlighted)?

    Hello, all.
    In iTunes 11.0.2.26, an Albums search by track names returns albums as if they only have one track on them, but I still want to access the entire album. How can I have the search results show the entire album (with just the searched for name highlighted)? For instance, I'm wanting to play an album with a particular track on it or I'm searching for albums that include that track. iTunes incorrectly assumes that all I'm after is that one track and then incorrectly displays the album as if there is only one ttrack on it. This is a bonkers default setting. Can I change this?

    Click the search magnifying glass and uncheck "Search entire library".
    Type in the name of the track.
    Click the album of interest to show tracks.
    Select the track.
    Press the X in the search box to clear the search.
    Double click the track you want to start playing first.
    tt2

  • I have two songs that show up in Music on my phone, but when the phone is connected to my computer, those two songs don't show as being on the phone in iTunes.  How do I fix this?

    I tried erasing all the music on the phone, and putting it back.  When I plugged in my headphones yesterday to listen to music while doing the dishes, and then pressed the button on the headphones to start the music, a song that I didn't add to my phone started playing.  I have the option to Show All Music turned off in settingsm but the songs still show up.  I am getting frustrated with this.

    the safest way would be method one from this support article:
    How to use multiple iPods, iPads, or iPhones with one computer.
    you can still share your music if you wish:
    how to share music between different accounts on a single computer

  • I have iphone 4s with iO6. My problem is I can no longer update my apps since "cannot connect to itunes" always shows on my screen when i try to. Tried fixing by changing the dates, turning off location as suggested in some forums but both didn't work!

    I have iphone 4s with iO6. My problem is I can no longer update my apps since "cannot connect to itunes store" always shows on my screen when i try to. Tried fixing by changing the dates, turning off location as suggested in some forums but both didn't work!  Please help!! Thanks.

    You can not merge accounts.
    Apps are tied to the Apple ID used to download them, you can not transfer them.

  • I'm new to Mac, have had for approx.  I put my iPhone and iPad and my wifes in iTunes and now when i start my system on.  I now have a Guest user show up at the log on screen.  Is this normal.  And how can I take it off.   Tried the help and no luck

    I'm new to Mac, have had for approx.  I put my iPhone and iPad and my wifes in iTunes and now when i start my system on.  I now have a Guest user show up at the log on screen.  Is this normal.  And how can I take it off.   Tried the help and no luck

    Tatanka11 wrote:
    I'm new to Mac,...
    Then...  You may find these Links of Interest and Value...
    Show me how to set up my Mac.
    http://www.apple.com/support/mac101/
    http://www.apple.com/support/switch101/     Switching from PC
    http://www.apple.com/findouthow/mac/
    Enjoy your Mac...

  • After a one week logout and shutdown my macpro 1,1 laptop shows a black screen at startup attempts. The battery is fully charged and both resetting the power manager  and zapping the PRAM have failed to permit startup. What else can I try?

    After a one week logout and shutdown my macpro 1,1 laptop running OSx 10.6.8 shows a black screen at startup attempts. The battery is fully charged and both resetting the power manager  and zapping the PRAM have failed to permit startup. What else can I try?

    Startup – Black screen with cursor
    Startup Issues - Resolve
    Startup Issues - Resolve (2)

Maybe you are looking for