Dell P2722HE 27" 16:9 USB Type-C IPS Monitor - Manual (Page 72)

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Troubleshooting
3. Move the joystick to highlight the Diagnostic icon and then press the
joystick to confirm. A gray test pattern appears.
4. Carefully inspect the screen for abnormalities.
5. Press the joystick to change the test patterns.
6. Repeat steps 4 and 5 to inspect the display in red, green, blue, black, white,
and text screens.
7. Press the joystick to end the diagnostic program.