Dell UltraSharp UP3221Q User Manual page 87

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. Press the Joystick again. 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, press the Joystick
again.
Troubleshooting
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