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I get a black screen after it goes to sleep.

359 Views 3 Replies Latest reply: Nov 4, 2012 8:04 PM by BDAqua RSS
dyh475 Calculating status...
Currently Being Moderated
Nov 4, 2012 1:01 PM

If I leave my computer alone for a length of time it will go to sleep and when I go to wake it up I get a black screen and then it goes back to sleep. I have tried changed different settings and nothing seems to work. It started after I had to go into authorization inside of ect and change to it to use normal login after I lost my USB key. If anyone has any idea how to fix this, that would be awesome. If I have to I'll reinstall but I really don't want to.

Mac mini, OS X Mountain Lion (10.8.2)
  • BDAqua Level 10 Level 10 (114,790 points)
    Currently Being Moderated
    Nov 4, 2012 3:57 PM (in response to dyh475)

    Is it 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.


  • BDAqua Level 10 Level 10 (114,790 points)
    Currently Being Moderated
    Nov 4, 2012 8:04 PM (in response to dyh475)

    Open Console in Applications>Utilities, check the system log for the date/time of the last problem  & next startup for clues.


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