Dell P5524Q 55" UHD 4K Commercial Monitor - Manual (Page 54)

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Troubleshooting
6. Press the Up key (button 1) on the back cover again. The color of the screen
changes to grey.
7.
Inspect the display for any abnormalties.
8. Repeat step 6 and 7 to inspect the display in red, green, blue, black, white and
text pattern screens.
The test is complete when the text pattern screen appears. To exit, press the Up
key (button 1) again.
If you do not detect any screen abnormalties upon using the built-in diagnostic tool,
the monitor is functioning properly. Check the video card and computer.