Thunderbolt display disconnects after that the iMac will switch to standby

I have a Mac IMAC (retina 5K, 27 inches, end of 2015) with a monitor second 27 "love at first sight.

Specifications are:

Chart: AMD Radeon R9 M390 2048 MB

Processor: 3.2 GHz Intel Core i5

Memory: 16 GB 1867 MHz DDR3

10.11.2 OS version (15 c 50)

When IMAC goes into sleep mode and wake up the 2nd monitor (thunderbolt) is no longer connected.  It's very frustrating!  Any ideas?

When this happens, open Applications-> Utilities-> System Information.

Look under lightning and check if the display is displayed.  Also check

Cards video/monitors to see if the display is listed there as well.  The first

Determines if the Thunderbolt connection is established, the second, determines

If the graphics card is grateful to the screen.

View the results, and then from there, we can go.

Tags: Mac

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