Stuck pixel flashing after changing refresh rate

You changed your monitor’s refresh rate and want to try a flashing pattern on a stuck pixel again. A setting change can alter how motion looks, but it does not tell you whether flashing is safe for you.

Use these checks before restarting a pattern in the Stuck Pixel Fixer. If you have a history of seizures triggered by flashing lights, or flashing has caused you symptoms before, skip the test rather than trying to prove it is safe.

Recheck the test before you run it

1. Open the Stuck Pixel Fixer and read the instructions shown in its window. It flashes colors quickly and includes a timer.
2. Before starting a pattern, check that you feel well and are not already experiencing eye strain, a headache, dizziness, or nausea. Do not run the test if you have had a reaction to flashing before.
3. Keep the room comfortably lit, set the screen to a brightness that feels comfortable, and sit at your usual viewing distance. Avoid watching from very close up.
4. If you decide to proceed, choose the shortest available timed run. Stay able to stop immediately, and do not leave the pattern running unattended.
5. Stop the pattern before changing the refresh rate. Once the display has settled, reassess how it looks and how you feel before deciding whether to run another short pass.

You do not need to stare at a flashing pattern to check whether you are comfortable. If you notice any warning sign, stop instead of trying to finish the timer.

What the result means

You feel fine during a brief pass

This only means you did not notice a problem during that pass. It does not prove that a longer session, a different pattern, or another display setting will be safe. Do not use a longer run just to confirm the result.

You notice discomfort or unusual symptoms

Stop the pattern right away and look away from the display. Do not switch to another refresh rate and immediately try again. If symptoms continue after you stop, take a break from the screen and seek medical advice. Treat a seizure or other urgent medical event as an emergency.

The pixel still looks wrong

The tool may attempt to free a stuck pixel, but it cannot repair a dead pixel or confirm that the display panel is healthy. Stop repeating the flashing test if it has not helped. For guidance on identifying a persistent defect, see stuck pixel vs. dead pixel.

How to change the refresh rate safely

1. Stop the flashing pattern first. Wait until the screen is showing its normal image before opening display settings. This makes it easier to judge the setting change without the pattern affecting what you see.
2. Choose the intended rate in Windows 11. Open Settings › System › Display › Advanced display, then choose a rate under Choose a refresh rate. If the new setting causes discomfort during ordinary use, stop the pixel test and return to a setting that was comfortable.
3. Check the available choices on a Mac. Open System Settings › Displays and select a refresh rate if your Mac and display offer that option. Some setups use a fixed or adaptive rate and do not show a manual choice.
4. Check a phone only if that is where you changed the setting. On Android, look under Settings › Display for an option such as Motion smoothness or Refresh rate. The name and choices vary by phone. If you cannot find a setting, do not install an app or change hidden settings just to run a pixel pattern.
5. Let the display settle before judging it. Some screens briefly go black or flicker while a new rate is applied. If the image does not return normally, follow the system’s on-screen prompt to revert, or choose the previous rate in display settings.
6. Skip another pass if you are unsure. A pixel test is optional. If the pattern looks uncomfortable or you cannot stop it promptly, close the tool window rather than continuing.

Why a new refresh rate can look different

Refresh rate is how often a display updates its image, measured in hertz (Hz). For example, a 120 Hz display can refresh up to 120 times each second. Changing the rate may affect the appearance of movement, but it does not establish that a flashing pattern is safe.

The browser and display work together to draw animations. The pattern’s appearance can depend on the screen, the browser, and the device’s graphics performance. A higher refresh rate does not automatically make flashing harmless, and a lower one does not automatically mean the test is dangerous. Do not use a particular number as a safety guarantee.

For people who are sensitive to flashing, the safest choice is not to run a flashing pixel test. You can inspect a suspected pixel with steady, nonflashing colors instead, or ask the manufacturer or a repair professional to assess the display.

If the test causes discomfort, stop it immediately and do not restart it at another refresh rate.