Dell P2720DCc User Manual page 62

Dell P2418HZ
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.
62 │ Troubleshooting
Dell 27 Monitor
? No USB Type-C Cable
The display will go into Standby Mode in 4 minutes.
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P2720DC