No output to Displayport

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4 points

No output to Displayport

I am using my 2015 13" MacBook Pro (running 10.11.3) with two external monitors. One connected via the full-size HDMI port and the other one connected via a mini-Displayport to (full-size) Displayport cable. There is an issue where after I disconnect the external monitors to use the internal display, the Displayport monitor does not get any input after I reconnect the MacBook to the external displays.

The steps to recreate the problem are as follows:

1. MacBook is closed and in sleep mode.

2. I come to the office, plug in power, my two external monitors, and my USB keyboard and mouse. MacBook stays closed.

3. I wake up the MacBook from the USB keyboard. Both monitors are detected and receive output from the MacBook.

4. I work. Time passes.

5. I disconnect all cables, move to a different location and use the MacBook as a laptop with the internal display.

6. I close the MacBook again, let it go to sleep.

7. I reconnect the MacBook to power, externals, and USB keyboard and mouse.

8. I wake the MacBook from the USB keyboard.

9. The HDMI display is recognized and shows the login screen. The Displayport is not recognized and does not get any input from the MacBook.

Typically, both displays work again after I quit for the day and come back the next day. I have checked that the cables are working properly and the monitor is working properly as well.

Both monitors are Benq GW2765.

MacBook Pro (Retina, 13-inch,Early 2015), OS X El Capitan (10.11.3), null

Posted on Feb 2, 2016 10:48 AM

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Answer 1

braden85

Community Specialist

Feb 3, 2016 2:04 PM in response to oceanhug

Hey oceanhug,

I understand that you are experiencing an issue with your MacBook Pro sending signal to a display under a certain set of circumstances. When these circumstances happen, I would suggest that you attempt to detect the display using these instructions:

Detect your display

If you're using an external display, sleep and wake your Mac to make it check for connected displays:

Press the power button on your computer to put it to sleep, or choose Apple menu > Sleep.

Wait a few moments, then press a key on your keyboard or click your mouse or trackpad to wake your Mac.

If you're using more than one display, and you can see the image on one of the displays, you can also use Displays preferences to check for connected displays.

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

https://support.apple.com/en-us/HT201177

Thanks for coming to the Apple Support Communities!

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