Dell P1424H User Manual page 30

Note: OSD menu supports English only.
NOTE: These messages also appears during normal operation, when the
computer USB Type-C cable is disconnected or damaged.
5. Reconnect the computer USB Type-C cable, then turn on your computer wait for
computer boot up is complete.
If your monitor remains dark after step 5, check your video controller and computer.
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30 Troubleshooting