Dell E2014T 19.5 Multi-Touch Monitor with LED - Manual (Page 37)

Troubleshooting
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37
or
or
NOTE: This message also appears during normal operation if the display cable
gets disconnected or damaged.
4. Turn off your monitor and reconnect the video cable; then turn on both your
computer and the monitor.
If your monitor screen remains blank after you use the self test, check your video
controller and computer, it shows monitor has a problem.