Dell P2720DCc User Manual page 64

4. Select the
5. Carefully inspect the screen for abnormalities.
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.
64 │ Troubleshooting
Dell 27 Monitor
Select Option:
icon to enable the built-in diagnostics.