Dell U2422H 23.8" 16:9 IPS Monitor - Manual (Page 88)

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Troubleshooting
3. Toggle the Joystick to highlight the Diagnostics icon, then press the Joystick,
and a gray screen appears.
4. Carefully inspect the screen for abnormalities.
5. Toggle the Joystick up . The color of the screen changes to red.
6. Inspect the display for any abnormalities.
7. Repeat steps 5 and 6 to inspect the display in green, blue, black, white and
text screens.
The test is complete when the text screen appears. To exit, toggle the Joystick up
again.