Dell S3422DWG User Manual page 62

NOTE: This box also appears during normal system operation, if the
video cable is disconnected or damaged.
4. Turn off your monitor and reconnect the video cable; then turn on your
computer and the monitor.
If your monitor remains dark after you reconnect the cables, check your video
controller and computer.
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62 Troubleshooting
Dell 34 Gaming Monitor
No DP Cable
The display will go into Standby Mode in 4 minutes.
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S3422DWG