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

Résumé: The following article provides information about running the self-test on Dell D1918H, D2421H, D2421DS, and D2721H monitors.

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Instructions

Monitor Self-Test

The self-test (integrated diagnostic tool) helps you determine if any screen abnormality you experience is an inherent problem with: (For example: Your monitor, video cable, video card, driver, 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 on the monitor simultaneously.
    D-Series Monitor Buttons
    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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Produits concernés

Dell D1918H, Dell D2421H, Dell D2721H
Propriétés de l’article
Numéro d’article: 000188980
Type d’article: How To
Dernière modification: 13 Nov 2025
Version:  12
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