Use of HDMI external monitor with my laptop closed

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Level 1

4 points

Use of HDMI external monitor with my laptop closed

Hi all. I'm actually using a McBook PRO connected to an external HDMI monitor. Everything is great and I can see properly the desktop of my laptop on the external monitor.

If I leave the computer on and active and I close the screen I should still be able to work with it and see the desktop on the external monitor. On the contrary the external monitor goes black.

If I try to move the USB mouse connected to wake the laptop , nothing happens.

This has been already tested with 2 different monitors and HDMI cables.

Any suggestion ? Anything I need to check in the Energy tab or something like that ?

I've one of the latest MacBook PrO 15" and I'm using Sierra

MacBook Pro, OS X Mavericks (10.9.1)

Posted on Sep 27, 2016 3:47 PM

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Answer 1

Sep 27, 2016 3:54 PM in response to Ita74

Use your Mac notebook computer in closed-display mode with an external display - Apple Support

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Answer 2

Ita74 Author

Level 1

4 points

Sep 27, 2016 4:02 PM in response to BobTheFisherman

Thanks for your quick reply.

Unfortunately I'm trying to do exactly what is suggested on the link you have provided.

I'm actually using a wired USB mouse and Keyboard for test.

Everything is fine when the display is open. I can see the desktop duplicated on the external monitor.

As soon as I close the laptop (leaving it active and not turned off of course..) the external monitor turns to black.

If I press any key on the keyboard or use the mouse nothing happens.

Monitor still black.

If I open again the McBook Pro , I can see immediately the desktop of my computer on the external monitor again

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Answer 3

Ita74 Author

Level 1

4 points

Oct 3, 2016 12:35 PM in response to Ita74

Does anyone have more suggestions ?

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Answer 4

Oct 3, 2016 1:38 PM in response to Ita74

Is your computer connected to AC power as it should be?

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Answer 5

Ita74 Author

Level 1

4 points

Oct 10, 2016 7:20 AM in response to BobTheFisherman

After you suggestion I had a look to my energy saving settings and apparently something was wrong there even if the laptop was connected to AC power...

Thanks again

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