Q: HDMI Splitter
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Mar 18, 2016 11:15 AMby norm123,HelpfulHello nlbc123,
I understand that you are having an issues with the external display on your MacBook Pro. Let's see if we can get that sorted out.
The first thing that you want to look over is seeing if you can detect the display is it is turned off while connected. Open up System Preferences > Displays and in the lower right hand corner of the window. If you don't see it, hold the Option key to bring this up. If that does not work then you will want try connecting the display directly instead through a HDMI splitter.
Take a look at the articles below for more details on detecting the display as well as additional troubleshooting to get this working for you.
OS X El Capitan: Connect multiple displays to your Mac
https://support.apple.com/kb/PH22153
Get help with video issues on external displays connected to your Mac
https://support.apple.com/en-us/HT201177
Take care
