Dell P2723D 27" 1440p Monitor - Manual (Page 65)

Troubleshooting │ 65
4. When initiated, a gray screen apppears. Inspect the screen for abnormalities.
5. Toggle the Joystick. The color of the screen changes to red. Inspect the
screen for abnormalities.
6. Repeat step 5 to inspect the display in green, blue, black, white and text
screens.
7. The test is complete when the text screen appears. To exit, toggle the
Joystick again.
If you do not detect any screen abnormalities upon using the BID tool, the monitor
is functioning properly. Please check the video card and computer.