Tips for finding Knowledge Articles

  • - Enter just a few key words related to your question or problem
  • - Add Key words to refine your search as necessary
  • - Do not use punctuation
  • - Search is not case sensitive
  • - Avoid non-descriptive filler words like "how", "the", "what", etc.
  • - If you do not find what you are looking for the first time,reduce the number of key words you enter and try searching again.
  • - Minimum supported Internet Explorer version is IE9
Home  >

KB-2805: OS X Login screen has strange pixelation or is blank

Mac & PC Management Service ,  

12 April,16 at 11:09 AM

Applies to: Mac OS X 10.7, 10.8


If a system is configured to enable monitor sleep and auto logout, it can cause a condition where the screen will go blank and does not display the login window. 

Moving the mouse will create pixelated lines that display the desktop items but not the login window. 

This is an Apple issue and is not specific to Centrify


To avoid this issue, it is recommended to change the value for monitor sleep to be longer than the value for auto logoff. 

The other workaround is to disable monitor sleep.


Apple has not provided an "official" response to this at this time.

Example of the behavior:


Still have questions? Click here to log a technical support case, or collaborate with your peers in Centrify's Online Community.