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Apple Computing Products:
macOS - Notebook Hardware
Dual Displays & Sleep Mode
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<blockquote data-quote="imme" data-source="post: 617967" data-attributes="member: 47631"><p>If you connect a macbook to an external screen with the lid open you will get a display on both screens. if you then close the lid of the macbook the system will go go sleep. If you then press a key on a USB keyboard etc.. this will wake the system even though the macbook screen may be closed and it will use the external monitor only, this is what people do when they only want to use the external monitor.</p><p></p><p>It sounds like something is waking your macbook up and because this id is closed it is only using the one screen. with my macbook, if i then open the screen it will not detect the macbook, I have to go into systems pref>displays and click the detect displays button and this sorts it out.</p><p></p><p>I hope this helps</p></blockquote><p></p>
[QUOTE="imme, post: 617967, member: 47631"] If you connect a macbook to an external screen with the lid open you will get a display on both screens. if you then close the lid of the macbook the system will go go sleep. If you then press a key on a USB keyboard etc.. this will wake the system even though the macbook screen may be closed and it will use the external monitor only, this is what people do when they only want to use the external monitor. It sounds like something is waking your macbook up and because this id is closed it is only using the one screen. with my macbook, if i then open the screen it will not detect the macbook, I have to go into systems pref>displays and click the detect displays button and this sorts it out. I hope this helps [/QUOTE]
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Apple Computing Products:
macOS - Notebook Hardware
Dual Displays & Sleep Mode
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