jacks2000

Q: My screen is freezing with broken pixels and lines

iMac i7 2.93Ghz 12gb DDR3 memory Running 10.7.5. Start Up Disc Lion HD

 

The issue appears to be random. Started a couple of months ago. The screen starts to freeze, mouse no longer works and unable to force quit apps or shut down normally and appears pixelated with various lines across the screen.

I can t say what triggers it and it seems to happen even when just a few minor apps are open like mail and Firefox.

The computer does seem to run hot and starts to work harder it seems.

 

The only way to resolve the freeze up is to hard shut down then pull the plug out of the power on wall and use the Pram key strokes to reboot. If I don't zap the pram or remove  the power plug it wont re start.

 

Hopefully I can attach a picture here.

Any info as to how to fix would be happilly recieved

JackieScreen Fault.jpg

Posted on Feb 3, 2015 10:02 AM

Close

Q: My screen is freezing with broken pixels and lines

  • All replies
  • Helpful answers

  • by Nymana,

    Nymana Nymana Feb 3, 2015 11:11 AM in response to jacks2000
    Level 1 (0 points)
    Feb 3, 2015 11:11 AM in response to jacks2000

    Pretty much have the same problem! Everything work, but always got the pixels blinking all over the screen, until the whole computer freeze (or at least the screen) and I have to reboot it. I can reboot with the button and my gear works (mouse etc) Had to buy a new mouse recently though. Don't know if it has anything to do with the comp.

    The comp seems to work way better in games (Heroes of Newerth) where the pixels are all gone. The comp. also seems to be a bit slower than usual overall, thinking at random.

     

    iMac i7 2.93Ghz 8gb DDR3 memory Running 10.10.2


    I am about to buy new graphic card. Would appreciate some help before that to confirm whats wrong.

  • by Old Toad,

    Old Toad Old Toad Feb 3, 2015 12:00 PM in response to jacks2000
    Level 10 (141,557 points)
    Mac OS X
    Feb 3, 2015 12:00 PM in response to jacks2000

    Is your iMac a mid 2011 27" with a AMD Radeon HD 6970M video card?  Check to see if it meets the requirements of this Apple 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 for a diagnosis.  Apple fixed my iMac at no charge under the recall.

    OTsig.png

  • by Nymana,

    Nymana Nymana Feb 3, 2015 12:12 PM in response to Old Toad
    Level 1 (0 points)
    Feb 3, 2015 12:12 PM in response to Old Toad

    Sadly no

     

    Its a mid 2010 27" with ATI Radeon HD 5750 1024 MB

  • by rkaufmann87,

    rkaufmann87 rkaufmann87 Feb 3, 2015 1:25 PM in response to Nymana
    Level 9 (58,919 points)
    Photos for Mac
    Feb 3, 2015 1:25 PM in response to Nymana


    I'm sorry to say but it appears your graphics card has failed. Take it to your local Apple Store or Apple Authorized Service Provider (AASP) to be professionally assessed then you can decide what to do. In the interim make sure you have a Time Machine backup and/or a bootable clone.