5 Replies Latest reply: Dec 10, 2012 1:51 PM by BDAqua
amuir Level 1 (0 points)

I have thirty four (34) 2010 mac mini running 10.8.2 connected vai HDMI displays. mac mini shuts down at 11pm and powers up at 6am- but will not wake screens from sleep. I have to use remote to wake up screens- wide range of screens Panasonic- LG- Sony- Samsung.

Mac mini (Mid 2010), OS X Mountain Lion (10.8.2)
  • BDAqua Level 10 (122,227 points)



    I wonder if it's a variation of this, of which I've seen many different symptoms...



    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.



  • amuir Level 1 (0 points)

    BD Aqua-

    thanks for that, I appreciate the quick response- however this is not the problem! The issue is that the actual external display display does not wake up when the mini powers on. I can view the screen through ARD with no problem. I can see the desktop and the digital signage software running fine.


    I was on with Apple Care for about an hour and a half and was escalated up the support chain. They say that they are not aware of this issue happening.


    the workaround was to set the on timer on the screen to wake the screen up 2 minutes before the mac mini boots up. However this will not work over time as the clock on the screens will drift- once they get ten minutes out the screens will go back to sleep.


    I hope apple can fix quickly!

  • woodmeister50 Level 5 (5,170 points)

    Something to try at least as a possible temp fix, is instead

    of scheduling the Minis to shut down, set them to sleep/wake



    The actual issue may have to do with how the HDMI works.

    If the monitors themselves are asleep, when the Mini boots,

    it may be sensing no active HDMI connection and hence does not

    activate video. 


    Is it safe to assume that the connection is HDMI->HDMI?  If so,

    you may try a DisplayPort->HDMI adapter on one of the Minis.

    This could atleast narrow it down to whether the issue is with

    the Mini HDMI port, or is a generic HDMI monitor issue with Minis/OSX. 

    The reason for trying this is that the Display Port has a different

    connection protocol than does HDMI at boot time.


    Now, I am not saying you have to buy adapters for all the computers

    at this point, but at least it may narrow down what the issue is.

  • amuir Level 1 (0 points)


    thanks for the reply... I actually did that. I had the mac go to sleep and wake up- but that didn't work either.

    I also tried mini displayport to DVI with no luck either- I didn't have a chance to do get a mini displayport to HDMI- I had to go with the screen timer method to get it sorted out.

  • BDAqua Level 10 (122,227 points)

    Ah, I see, good work on the temp workaround.