Mac Pro is not displayed after the passage of the screens

OK, so this is a strange problem but it's very annoying (at least for me). I just bought a LG Ultrawide 29 "display and connected via a HDMI cable to my Mac Pro (Home machine) and a second HDMI cable to my Macbook Pro (desktop computer). The Mac pro / Macbook pro good work with the big screen, HOWEVER, when I use my Mac pro and select the tilt of the screen to switch to the HDMI 2 connection, it works and rocking on my Macbook pro. But when I try to switch it back to HDMI 1 (Mac Pro), it comes back with a black screen and says no signal. Even if I plug the HDMI cable it does not work. I set the timer to 3 hours sleep, doesn't always help. I know he's not missing sleep because itunes can be played when I spend and still playing music throughout and continued when I try to switch back. The only way I could get is long, press the button on my Mac Pro and restart.

The only reasonable difference that I know is that the Macbook pro is running Yosemites, while my Mac Pro running Beta El Capitan. I have a feeling, this is probably the cause, but I just wanted to know if someone has solved this problem somehow.

Thank you

Hello Hemlock70,

Thank you for using communities of Apple Support.

I understand that your external screen remains completely black, with a message no signal, during the passage of the views.  For assistance with this problem, please go through the steps in the link provided below.

Get help with graphical problems on external displays connected to your Mac.

Take care.

Tags: Mac

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