Dell E5515H Monitor - Manual (Page 52)

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Troubleshooting
4. This box also appears during normal system operation, if the video
cable becomes disconnected or damaged. The monitor will enter
Power Save Mode after 5 minutes if left at this state.
5. 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 previous
procedure, check your video controller and computer, because your
monitor is functioning properly.
NOTE: Self-test feature check is not available for S-Video, Composite,
and Component video modes.