5 Replies Latest reply: Feb 7, 2014 5:56 PM by Steve Zavodny
Steve Zavodny Level 1 (85 points)

2 monitors and the analgue one comes out of sleep into odd ball resolutions, and the system prefs do not

show the normal choices to re-establish the proper resolution.  And then sometimes this fixes itself out of sleep.

So there must be a fix by now??  Only since Mavs

OSX mavs

Mac Pro (Early 2009), OS X Mountain Lion (10.8.2)
  • sterling r Community Specialists

    Hey there Steve Zabodny,


    It sounds like you have an external monitor that is not waking up with the correct resolution. I wanted to recommend performing the troubleshooting in this article named:

    Apple computers: Troubleshooting issues with video on internal or external displays


    Check connections

    When using an external display be sure to check the following:

    1. If you're using an Apple notebook, confirm the AC power cable or adapter is securely connected to the computer and the cable providing power to the display is also secure. It is always good to have your notebook connected to AC power when an external display is in use.
    2. Confirm display adapters are fully seated in their respective connections and that they are supported models and for the computer and display. Refer to these articles to assist you with adapter compatibility and further configuration information:
    3. Remove all display cable extenders, KVM switches, or other like devices and retest to determine if the issue is resolved.
    4. Try unplugging the video adapter or cable and then plug it back in.
    5. If more than one video adapter is in use (or "daisy-chained"), troubleshoot by using only one adapter.
      • Example: A mini DisplayPort to DVI adapter connected to a DVI to HDMI adapter is an unsupported configuration because there is a series of adapters in use.
    6. If available, try using a different display and or adapter (or use a different connector by using DVI instead of VGA, for instance).

    Reset the systemYou can reset the Mac's parameter RAM and SMC.Reset the resolutionStart by resetting the Mac's parameter RAM. If the display does not come up, was previously set to an unsupported resolution, and still results in no video:

    1. Start up in Safe Mode.
    2. From the Apple () menu, choose System Preferences.
    3. Choose Displays from the View menu to open the preferences pane.
    4. Select any resolution and refresh rate that your display supports.
    5. Restart your computer.


    Thank you for using Apple Support Communities.

    Take care,


  • Steve Zavodny Level 1 (85 points)


  • gentboy Level 1 (0 points)

    I thinnk your monitor stops working.

  • Steve Zavodny Level 1 (85 points)

    OK PRAM is ineffective.  This is the analogue display of the two ports.

    Never happend prior to Mavericks.  Note when the wrong resolution comes

    up after sleep, there is no choice to change resolution. Always need to restart or

    sleep a few more times till this thing fixes itself.  Can I be the only one?

  • Steve Zavodny Level 1 (85 points)

    Anyone else please?