External Screen goes on sleep mode after plugging it in

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External Screen goes on sleep mode after plugging it in

Hi,

I'm having trouble with my external monitor, as soon as I plug it in, it goes to sleep and doesn't display anything.

My Macbook (Retina mid-2012) can recognise the screen, as I see it in the preferences (name and reference), but it doesn't display anything, I also tried another screen, with another HDMI cable, it's the same thing.

Specs :

Mid-2012 Retina Macbook Pro

2.6Ghz i7

16gb of memory

Graphics : nVidia GeForce GT 650 @ 1gb + Intel HD400

Running on El Capitan.

MacBook Pro with Retina display, OS X El Capitan (10.11.1)

Posted on Dec 28, 2015 12:52 AM

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Answer 1

Nubz N.

Community Moderator

Dec 29, 2015 8:03 AM in response to kibstr

Hi kibstr,

I understand your Macbook Pro knows you have connected your extertal display but the external screen(s) stay black. They go to sleep as if not getting a signal. Good job testing with another cable and display.

There's a troubleshooting section "If the display image is blank or unusable" in this article:

Get help with video issues on external displays connected to your Mac - Apple Support

Although you have tried some of the steps, please try the other steps.

Thank you for using Apple Support Communities.

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Answer 2

kibstr Author

Level 1

0 points

Dec 29, 2015 10:30 AM in response to Nubz N.

Hi Nubz N.

Just followed and tried the troubleshooting described on that page, and still, nothing changed.

I'm a little worried that this might be a hardware issue. 😟

Tried the other ports on that side they still work. (USB & Card reader)

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Answer 3

Nubz N.

Community Moderator

Dec 29, 2015 10:44 AM in response to kibstr

Howdy kibstr,

Thanks for going through the article. If you have gone through all the troubleshooting there is that last step.

Get more help

If you've tried these steps and your display still isn't working, contact Apple Support to get more help.

Diagnostic fees may apply for issues not covered under warranty or the AppleCare Protection Plan (APP).

Let us know what you find.

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