MacBook Pro 15 "cannot use the two fell in love at the same time

I am trying to connect to three external displays to my Macbook Pro 15 "."

Connect a monitor to the HDMI and the other two to love at first sight.

Only two monitors will give me a picture.

If I disconnect monitor work, one that was not working will start working.

I can change the ports between monitors and work always only two monitors.

I can open my Macbook and the inbuild screen working as a third screen.

But the external screens appears only two at a time.

Why is this?

I use El Capitan.

I tried the "Display search" function in settings.

I also tried to restart.

I also tried to unplug power for screens cables.

It does not support the three external displays.

https://support.Apple.com/kb/SP719

"Support simultaneous native resolution on the built-in display and up to 3840 x 2160 pixels on up to two external displays, both at millions of colors."

Tags: Peripherals

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