Please visit the new Mac-Forums Facebook page:
https://www.facebook.com/macforums1




Results 1 to 8 of 8
  1. #1
    Please help, tons of flashing pixels cover my screen
    Hello, I really need help! My iMac has been having issues for months where these random colored pixel pop up all over my screen. Often I can wipe them away with a window I have open on my desktop. My boyfriend thought my iMac just needed to be reformatted. So I backed everything up and erased everything and installed the newest os. And the problem is now worse. Twice as many flashing pixels, some won’t even go away. And colored lines around my dock now too. It’s a mess. We were able to make them go away by booting in safe mode, but there was nothing installed other than the high Sierra OS. and I also did two hardware test (regular and extended) both came out ok. I’m at a loss. Is this something that can be fixed or do I need a new iMac? It’s a 21.5 inch iMac (mid 2011) 2.8 i7 intel processor, 16 gb memory, and an AMD radeon hd 6770m 512 md graphic card. Oh and I’ve also been experiencing several kernel panic and my iMac has been restarting itself frequently. Please help.

    11910457676c9c5cd02ce01b3b69b4f2efb0cfcb32e3d5385423a58fd6faf96f6bf33ec7.jpg

    027135308021549d3f924be55585ad0144d190e2795b7a873f68dd23e4981d888475b6a1.jpg

    14528003cda5ac088c967e0905671081d31398cb8ea7e124f03222fd2e824f511ae7e740.jpg

    958682251a4ec7e37f44d86170c547595c11a4fbdc0ddd84a8e3086128b54c86b8f427ce.jpg
    Attached Images Attached Images
    Last edited by hellataz; 12-29-2017 at 03:07 PM. Reason: adding photos

  2. #2
    Please help, tons of flashing pixels cover my screen
    Raz0rEdge's Avatar
    Member Since
    Jul 17, 2009
    Location
    MA
    Posts
    11,866
    Rep Power
    22
    Those types of graphical artifacts are usually indicative of a GPU issue. If they can be "wiped" away by moving a window around, it's just beginning to fail and will get worse as time goes on and the issues will either persist regardless of what you do.

    Grab a copy of Cinebench, a graphics benchmarking tool, and see what happens. This application will stress the GPU primarily so if you start seeing issues, then you should start thinking about possible fixes (replacing logicboard or upgrading to a newer iMac)
    --
    Regards
    ...Ashwin


  3. #3
    thank you I will try that.

  4. #4
    Please help, tons of flashing pixels cover my screen
    Raz0rEdge's Avatar
    Member Since
    Jul 17, 2009
    Location
    MA
    Posts
    11,866
    Rep Power
    22
    Thank you for the images, that's very informative and does further indicate that it's a failing GPU. The problem will worsen over time, unfortunately as the GPU continues to fail.
    --
    Regards
    ...Ashwin


  5. #5
    Screen Shot 2017-12-29 at 11.12.17 AM.png

    Screen Shot 2017-12-29 at 11.13.56 AM.png

    Not sure what this means but I ran the test and got these results. also a bit of pixeling appeared during the first test.

  6. #6
    Please help, tons of flashing pixels cover my screen
    MacInWin's Avatar
    Member Since
    Jan 01, 2009
    Location
    Winchester, VA
    Posts
    6,327
    Your Mac's Specs
    MBP 15" Mid 2015, iPhone XS, an iMac, plus ATVs, AWatch, MacMini
    Rep Power
    26
    That's a pretty old iMac, and may or may not be worth repairing. You can check at ifixit.com to see if it can be fixed, and if you want to try it, assuming it can be.

    Unfortunately, this site is being closed by the owners on December 31, so we won't be able to assist you hear. If you want to keep in touch read this thread about the closure and what the admins/moderators have decided to do:

    http://www.mac-forums.com/news-and-c...ml#post1781568

    It is long, but most of the posts are short. Look for dtravis7, slydude, chacag posts for the efforts.
    Jake

  7. #7
    Please help, tons of flashing pixels cover my screen
    Raz0rEdge's Avatar
    Member Since
    Jul 17, 2009
    Location
    MA
    Posts
    11,866
    Rep Power
    22
    The values from Cinebench aren't important, interesting for other purposes but not here, it's really a way of putting more stress on the GPU than your normal usage to see if that would exasperate the issue and make it appear worse or more often. Again, there isn't a software fix for the issue, it's either an expensive logicboard replacement or upgrade to a newer iMac.
    --
    Regards
    ...Ashwin


  8. #8
    Please help, tons of flashing pixels cover my screen
    jasongoldworthy's Avatar
    Member Since
    Aug 28, 2017
    Location
    Wales, UK
    Posts
    163
    Your Mac's Specs
    iMac Late 2009 32GB Intel Core i7 27" OSX 10.13.6
    Rep Power
    3
    hi there,

    its a failed GPU

    if you go to the famous selling site you will see many replacement GPU's for this iMac
    it is time consuming but can be done,
    Mac Pro 5,1
    128GB Ram
    Mac OSX 10.14.5
    512GB NVME 2TB x4

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Block of pixels on screen
    By mcolman in forum Apple Desktops
    Replies: 2
    Last Post: 06-09-2009, 05:12 PM
  2. Moving Red Pixels all Over my screen!
    By hugo14 in forum Apple Desktops
    Replies: 2
    Last Post: 09-26-2008, 04:23 PM
  3. busted screen pixels
    By whitetar in forum Switcher Hangout
    Replies: 2
    Last Post: 08-17-2008, 11:59 AM
  4. iphone screen...to cover or not to cover?
    By Xyphos in forum iPhone Hardware and Accessories
    Replies: 4
    Last Post: 07-13-2008, 02:43 AM
  5. iphone screen...to cover or not to cover?
    By Xyphos in forum iPhone Hardware and Accessories
    Replies: 1
    Last Post: 07-12-2008, 11:56 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •