Dell U2913WM, problem with use of the display port

I have the following problem with a Dell U2913VM monitor with use of its display port.
When I first turn the monitor on, the computer turns on and the monitor turns off
 And the monitor needs to be reset to get it to ever again to turn on.
Is this expected with use of the display port on a Dell U2913VM monitor?

Using an XFX Radeon R7irs 360 video graphics card with the three Dell monitors connected as follows
 Dell U2913VM monitor to the display port
 Dell U2412M monitor to the DVI-I
 Dell U2412M monitor to the DVI-D

The problem appears with this power on sequence.

Press the power on for the Dell U2913VM monitor, white power led flashes and then turns off
 then computer turns on - yes the computer
  the DELL U2913VM monitor turns off 
  unable to turn on the Dell U2913VM  monitor "forever" until it is reset 
Screens are displayed on the two Dell U2412M monitors

This is the reset for the Dell U2913VM monitor
In order to turn on the Dell U2913VM monitor, even after the computer is turned off
 remove the display port cable
  unplug the monitor from the electric power
  wait one minute
   plug the monitor back into electric power; monitor can now be powered on and off fine

The Dell monitor diagnostics run fine after the Dell U2913WM is reset.,

With the above configuration, all monitors work fine if I turn on the computer first

This was baffling at first as all was working fine.  I had been turning the computer first.

I reproduce the above again and again.

With a different configuration, all monitors work fine, regardless if the monitors are turned first or the
computer.  This is the different configuration.
  Dell U2913VM monitor to the DVI-D
  Dell U2412M monitor to the display port
  Dell U2412M monitor to the DVI-I 

I realize I found workarounds.  I prefer to use the display port cable to the Dell U2913VM monitor without the special power on sequence.  Or have to do a hard reset if the Dell U2913WM monitor is turned on first.

I almost returned the Dell U2913WM monitor as defective.  As someone-else had returned it, I bought it at a discount as an open box item.

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