KPOriginal

Q: IMac2011 27" grey screen with grey verticals on startup, moves halfway thro process then restarts and stays on grey screen. Cannot start with safe mode or utilities as far as I can see. Ideas?

IMac 2011 27" shows grey screen with wide green vertical bands on start up, moves halfway thro the process, cuts out, restarts and sticks on grey screen. Can access nothing. Help, please.

MacBook, OS X Yosemite (10.10.1)

Posted on Jan 5, 2015 8:35 AM

Close

Q: IMac2011 27" grey screen with grey verticals on startup, moves halfway thro process then restarts and stays on grey screen. Cannot ... more

  • All replies
  • Helpful answers

  • by Old Toad,

    Old Toad Old Toad Jan 5, 2015 11:19 AM in response to KPOriginal
    Level 10 (141,557 points)
    Mac OS X
    Jan 5, 2015 11:19 AM in response to KPOriginal

    Check to see if you iMac is part of this graphic card recall: iMac (27-inch): AMD Radeon 6970M Video Card Replacement Program - Apple Support

     

    If it is and is within the 4 year time limitation make an appointment immediately at the nearest Apple Store Genius bar to get it looked at.  I have similar issues (but could boot and work) and they replaced the card for free.

    OTsig.png

  • by KPOriginal,

    KPOriginal KPOriginal Jan 5, 2015 11:38 AM in response to Old Toad
    Level 1 (0 points)
    Jan 5, 2015 11:38 AM in response to Old Toad

    TThanks. How can I check this without access to the computer?

  • by Old Toad,

    Old Toad Old Toad Jan 5, 2015 1:09 PM in response to KPOriginal
    Level 10 (141,557 points)
    Mac OS X
    Jan 5, 2015 1:09 PM in response to KPOriginal

    Do you have any of the purchase paperwork that came with your iMac.  It might have some of the info on it, i.e. the CPU type and

     

    First see if you can Boot into Safe Mode, Mac OS X: Starting up in Safe Mode.  If you can you can access the About This Mac menu option and the System Report from there to see if you have the recalled graphic card.

     

    If that fails see if you can Boot into the Recovery volume (boot with the Command + R keys held down) and access the About this Mac info from there.

     

    Or look on the iMac for the serial number and compare to this info:

    t

    he iMacs must fall in the following serial number configurations:

    The last four characters of the serial number must contain one of the following groups (for example, xxxxxxxxDHJQ):

    • DHJQ, DHJW, DL8Q, DNGH, DNJ9, or DMW8
    • DPM1, DPM2, DPNV, DNY0, DRVP, DY6F, F610

    If the iMac falls within one of the above the serial number categories and is confirmed to have the graphics card issues, Apple will replace the AMD card free of charge up to three years from the computer’s purchase date

    This is from this website: Apple opens graphics card replacement program for some ...