Dell P2222H User Manual page 69

3. Move the joystick to highlight the Diagnostic icon
to confirm. A gray test pattern appears.
4. Carefully inspect the screen for abnormalities.
5. Press the joystick to change the test patterns.
6. Repeat steps 4 and 5 to inspect the display in red, green, blue, black, white,
and text screens.
7. Press the joystick to end the diagnostic program.
Select option:
then press the joystick
Troubleshooting
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