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Mountain Lion wakes up to blue screen

2114 Views 8 Replies Latest reply: Feb 11, 2013 9:19 AM by BDAqua RSS
weitzar96 Calculating status...
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Aug 13, 2012 11:05 AM

After upgrading to Mountain Lion- iMac wakes up to blue screen . Reboot is the only way to get out of this state. Any ideas?

iMac, OS X Mountain Lion
  • BDAqua Level 10 Level 10 (114,670 points)
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    Aug 13, 2012 12:37 PM (in response to weitzar96)



    I wonder if it's a variation of this...



    Move the mouse or trackpad cursor over the center area of the login window so you can see the user icons. Click on the icon of the user that you would like to login as, type in the user's password, and press Return.

    If the login window is configured to show only the name and password fields, type in the user's name and password into the fields, and press Return (even if you cannot see the rest of the login window).

    Additional Information

    This issue will not occur if the display is not sleeping when the account is logged out. Use the steps below to confirm that the account is not configured to log out automatically while the display is sleeping:

    1. Open System Preferences > Security & Privacy > General.  Click the padlock to unlock the preference pane and enter your admin password. Click the Advanced button at the bottom, then see if the option "Log out after N minutes of inactivity" (where N is the number of minutes) is enabled.
    2. Open System Preferences > Energy Saver and configure Display Sleep to occur after the account is logged out, by dragging the slider to a number of minutes that is greater than N was set to in the previous step.

    Important: If automatic log out is not needed, disable "Log out after Nminutes of inactivity" in System Preferences > Security & Privacy > General. This will also prevent the issue.

  • John in Paris Calculating status...
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    Aug 28, 2012 1:45 AM (in response to weitzar96)

    Do you mean that everything is displayed with a light blue tint? I have the same problem with my MacBook Pro, but never when I wake up.


    I found a workaround from the user "Umputun" in this discussion: Blue tinted screen after mountain lion


    See my reply in that discussion for details about how it works for me. I'm not sure if it'll solve you problem, since it happens for you when you wake up your iMac.

  • sandiegoscott Calculating status...
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    Oct 9, 2012 6:05 PM (in response to weitzar96)

    John In Paris, BDAuqa--


    No, there's no logon window to see and it's not a light blue tint, it's solid blue. I have the same problem on a new Mac Mini with Mountain Lion. Reminds me of the "blue screen of death" on a PC, except it's blank where the PC had a "you're screwed" text message.


    I've only been a Mac user for a year and a half. I'm disappointed to be encountering such problems. If I wanted problems I would have stuck with the PC. At least there I could fix them.


    Scott O

  • trusk Calculating status...
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    Nov 24, 2012 12:49 AM (in response to weitzar96)

    I have the exact same problem, only started appearing about a week or so ago.

  • sandiegoscott Level 1 Level 1 (0 points)
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    Nov 24, 2012 10:22 AM (in response to trusk)

    I encourage anyone encountering this problem to make a bug report to Apple at or at if you have a developer ID or are willing to take the time to sign up for one.

  • bigsadhu Calculating status...
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    Feb 3, 2013 9:36 AM (in response to weitzar96)

    I'm late to the party here, but have the identical issue occurring occasionally on my 2011 Mini server. Has anyone found a solution yet?



  • BDAqua Level 10 Level 10 (114,670 points)
    Currently Being Moderated
    Feb 11, 2013 9:19 AM (in response to weitzar96)

    Ah, great to hear, thanks for the report!


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