Alienware AW3821DW 37.5" 1600p 144 Hz Curved Gaming Monitor - Manual (Page 64)

64 | Troubleshooting
4. Turn off your monitor and reconnect the video cable; then turn on both
your computer and the monitor.
After performing the above steps, if the monitor displays no video output, then
the problem may be with the graphics card or the computer.
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.
NOTE: You can run the built-in diagnostics only when the video cable is
unplugged and the monitor is in self-test mode.
To run the built-in diagnostics:
1. Ensure that the screen is clean (no dust particles on the surface of the
screen).
2. Press and hold Button 3 for five seconds. A gray screen appears after one
second.
3. Observe if the screen has any defects or abnormalities.
4. Press Button 3 again. The color of the screen changes to red.
5. Observe if the screen has any defects or abnormalities.
6. Repeat steps 4 and 5 to inspect the display in green, blue, black, and white
screens.
The test is complete when the white screen appears. To exit, press Button 3
again.
If you do not detect any screen abnormalities upon using the built-in diagnostic
tool, the monitor is functioning properly. Check the video card and computer.