How to Run the Dell D1918H, D2421H, D2421DS, and D2721H Monitor Self Test

Monitor Self-Test

The self-test (integrated diagnostic tool) will help you determine if any screen abnormality you experience is an inherent problem with your monitor, video cable, video card, drivers, or computer.

Steps for running the self-test:

1. Disconnect all video cables from the monitor and turn off your monitor.

2. Turn on the monitor.

3. When the Dell logo disappears and the screen shows "No signal," press buttons 2 + 3 + 5 (Figure 1) on the monitor simultaneously.
   
   Figure 1
   
   The monitor enters the self-test screen.

4. Carefully inspect the screen for abnormalities as the display turns to red, green, blue, black, and white automatically.

5. Press button 5 to exit the self-test screen.

If you do not detect any screen abnormalities while using the self-test tool, the monitor is functioning properly. Check your video cable, video card, drivers, and computer.

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