OS Lucinity

Q: Macbook Won't Wake Up After Disconnected From Monitor

At home I connect my Macbook to an Apple Cinema 30 and USB keyboard/mouse. During use the Macbook lid is closed. Frequently when disconnected, opening the lid won't wake up the computer. The screen remains black. No amount of closing, reopening, and pressing keys will wake it up. I've been hard rebooting when this occurs.

Anyone know a solution?

Macbook Pro, Mac OS X (10.6.6)

Posted on Feb 18, 2011 9:48 AM

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Q: Macbook Won't Wake Up After Disconnected From Monitor

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  • by oregonjoe,

    oregonjoe oregonjoe Jun 23, 2015 3:20 PM in response to Kappy
    Level 1 (14 points)
    iOS Apps
    Jun 23, 2015 3:20 PM in response to Kappy

    Apple's support page gives no warning about never putting your macbook to sleep when disconnecting a display. In fact it says the opposite, to put your computer to sleep just to be safe. From the Apple support page:

     

    For best results, put your computer to sleep before disconnecting your display.

     

    How to use your Mac notebook computer in closed-clamshell (display closed) mode with an external display - Apple Suppor…

     

    That said, I believe they are wrong, or there is a bug, because I too have problems with my macbook not waking up when I put it to sleep before unplugging my monitor.

  • by malcolmhall,

    malcolmhall malcolmhall Jul 8, 2016 1:02 AM in response to joeln123
    Level 1 (4 points)
    Jul 8, 2016 1:02 AM in response to joeln123

    I still have this years-old problem on OS X 10.11.5 with a MacBook Pro (Retina, 15-inch, Mid 2015) with Intel Iris Pro. The monitor is a Samsung U24E850R connected via display port.

     

    The MacBook Pro with lid shut is connected to the monitor and on charge, however the setting to "prevent computer from sleeping automatically when the display is off" is not checked so I can assume it was asleep as it has been left all night. In morning it is disconnected from the display, and then when opening lid to use it the screen stays black, force touch pad does not vibrate, networking is disabled cannot remote log in, the only sign of life is the backlight on keyboard comes on. The Macbook Pro needs hard reboot. After the reboot I take a sysdiagnose and have been attaching them to this bug report: 26419697

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