Screen Test Blog — Guides & Troubleshooting

Keyboard Ghosting, Dead Keys and Stuck Keys: How to Tell Them Apart

Dead keys, stuck keys and ghosting are three different faults. Learn how to tell them apart in a browser keyboard test, and what n-key rollover really means.

Why Does My Mouse Double-Click on One Press?

A single press that registers as two clicks is usually switch chatter. Learn how to confirm it in your browser and how to tell hardware wear from a software setting.

Backlight Bleed vs IPS Glow: How to Tell the Difference

Backlight bleed and IPS glow can look similar on a black screen. Learn how to tell them apart and test your monitor with fullscreen tools.

How to Check Your Monitor Refresh Rate Online

Check your monitor refresh rate online and learn why a 144Hz, 165Hz, or 240Hz display may still show 60Hz.

How to Test a New Monitor Before You Keep It

Use this 10-minute checklist to check a new monitor for dead pixels, backlight bleed, ghosting, refresh rate, resolution, and text sharpness.

OLED Burn-In vs Image Retention: How to Check Your Screen

Learn the difference between OLED burn-in and temporary image retention, then check your screen with fullscreen solid colors.

Why Does Text Look Blurry on My Monitor?

Find out why monitor text looks blurry and check sharpness, native resolution, scaling, zoom, and display settings.

Why Is My Webcam Not Working in the Browser?

Troubleshoot a webcam that is not working in the browser and check camera permissions, device selection, app conflicts, and privacy settings.

What Is a Dead Pixel? Dead vs Stuck Pixel Explained

Dead pixel or stuck pixel? They look alike but only one can usually be fixed. Learn the difference, what causes them, and how to test your screen for free.

How to Fix Stuck Pixels on Any Monitor or Screen

A stuck pixel is frozen on one color but can sometimes be fixed. Learn the most effective methods — including rapid color cycling — to revive a stuck pixel on any monitor.

What Is Backlight Bleed and How to Test Your Monitor for It

Backlight bleed is light escaping around the edges of your LCD panel. Learn what causes it, how it differs from IPS glow, and how to test your monitor for free.

Monitor Ghosting: What It Is, What Causes It, and How to Fix It

Compare trails and outlines at a fixed refresh rate, understand the limits of browser tests, and record useful evidence before contacting support.

Color Banding on Your Monitor: Causes and How to Fix It

Color banding makes smooth gradients look like stepped bands. Learn what causes it on your monitor and how to fix it by adjusting GPU color range settings.

Monitor Sharpness Settings: How to Get the Crispest Image

Choose monitor sharpness by comparing text and edges, not a universal number. Follow a repeatable test and separate sharpening from resolution and scaling.

Can Dead Pixels Be Fixed?

Does My Warranty Cover Dead Pixels?

Check your exact model and regional pixel policy, distinguish bright from dark dots, and gather the photographs and purchase details support needs.

How to Quickly Spot Dead Pixels on Any Screen

Learn how to perform a quick dead pixel test on your monitor or mobile device using pixeltest.net.