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Dell XPS 8900 enters unrecoverable state if Dell U2413 monitor is switched off

I have a new Dell XPS 8900 connected to a Dell U2413 monitor using the HDMI to mini-HDMI cable.  When I switch off the monitor (to save the screen and energy), the PC jumps into an unrecoverable power saving mode, shutting down all open applications in doing so.  The mouse and keyboard lock up.  The only way to restart the PC is to press the power button for several seconds (hard reboot).   This began happening recently.  What can be done to fix?

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