✅ 1. Physical & Connection Check

• Make sure power cable is connected securely.

• Ensure video cable (HDMI, DisplayPort, VGA, DVI, USB-C) is plugged in properly.

• Try another video cable or port to rule out cable/port issues.

• Test the monitor on a different PC or laptop.

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✅ 2. Basic Display Test

• Use this free website: https://www.testufo.com

• Or go to: https://www.eizo.be/monitor-test/

These sites help test:

• Color accuracy

• Brightness/contrast

• Dead pixels

• Backlight bleeding

• Refresh rate & motion blur

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✅ 3. Windows Built-In Display Test

On Windows:

1. Right-click desktop → Display Settings

2. Check:

   • Resolution

   • Refresh rate (under Advanced Display)

   • Multiple monitor setup

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✅ 4. Look for Problems

• Dead pixels: Tiny black/white/red spots.

• Color banding: Poor color gradients.

• Ghosting or tearing: Blurred or torn images in motion.

• Flickering or lines: May indicate hardware or power issue.

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✅ 5. Advanced Tools

If needed:

• Dead pixel checker: Tools like “InjuredPixels” or websites.

• Color calibration: Use software like DisplayCAL or built-in Windows color calibration.