How do I turn off my iMac display when using an external monitor?

[Mikebike125]

I have a late 2015 iMac and now have my TV connected with an HDMI cable. How do I tun off my iMac screen when I am watching a movie on my external monitor/TV? I am using elCapitan.

Thank you!!

 

[apfelmann]

it's a shame but this is not possible ... maybe with third party software

 

[Mikebike125]

it's a shame but this is not possible ... maybe with third party software

Really? I am stunned this can't be done. I tried turning the brightness all the way down but that didn't do the trick. Is there maybe a way to tell it to use the external monitor only??
If it can't be done maybe I'll just throw a towel over it when I need to.

 

[Daisy81]

Really? I am stunned this can't be done. I tried turning the brightness all the way down but that didn't do the trick. Is there maybe a way to tell it to use the external monitor only??
If it can't be done maybe I'll just throw a towel over it when I need to.

You just want the screen to go dark? You could make a black image and put it up full screen on the monitor to blank it out.

I think iTunes might black out the other screen on its own if you make the video (not the program itself) go full screen if I recall.

 

[apfelmann]

Really? I am stunned this can't be done. I tried turning the brightness all the way down but that didn't do the trick. Is there maybe a way to tell it to use the external monitor only??
If it can't be done maybe I'll just throw a towel over it when I need to.

using BOOTCAMP and windows it is possible ... ;-)

 

[Daisy81]

using BOOTCAMP and windows it is possible ... ;-)

I have yet to run bootcamp on a Mac. I have used VMWare Fusion and love it but I don't like the idea of having to reboot to switch operating systems.

 

[JonnyBlaze]

I and others discussed the same question here...https://forums.macrumors.com/threads/how-to-turn-off-imac-screen-but-leave-secondary-screen-on.838040/page-2#post-22369776

This works... https://github.com/Eun/DisableMonitor