Dell U3821DW 37.5" 21:9 Curved IPS Monitor (Silver) - Manual (Page 72)

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Troubleshooting
Built-in diagnostics
Your monitor has a built-in diagnostic tool that helps you determine if the screen
abnormality you are experiencing is an inherent problem with your monitor, or with
your computer and video card.
To run the built-in diagnostics:
1. Ensure that the screen is clean (no dust particles on the surface of the
screen).
2. Move and hold the joystick up/down/left/right for about 4 seconds until a
pop-up menu appears.