Green dot on black screen after switching HDR

A tiny green dot on a black screen can stand out after you switch HDR on or off. It may be a stuck green subpixel, but a display mode, cable, or graphics glitch can also create a mark that looks similar.

First check whether the dot stays in the same place and appears in different conditions. The Display Test can show solid colors to help you inspect the screen. If the spot appears to be a stuck pixel, the Stuck Pixel Fixer can flash colors in an attempt to free it, but it cannot repair a physically damaged display.

Check the dot safely

1. Open the Display Test and inspect the screen on solid color backgrounds. Look for the dot on black, white, red, green, and blue. Keep the brightness comfortable, and do not stare at flashing patterns.
2. Switch HDR off, then on again, and check whether the dot changes. In Windows 11, use Settings › System › Display › HDR. On a Mac, open System Settings › Displays, select the display if needed, and check its available HDR setting.
3. Check the dot on another screen or input if possible. You can also take a screenshot and view it on a different device. A physical pixel defect will not normally be part of the screenshot image.
4. If the dot stays fixed through these checks, you can try the Stuck Pixel Fixer briefly. Stop if flashing is uncomfortable or could affect you, including if you are sensitive to flashing light.

What the result means

The dot appears only with HDR on or off

A dot that appears only in one mode may be related to a display profile, graphics driver, cable, or HDR processing rather than a permanently stuck subpixel. Restart the computer, check for a graphics update, and test another cable or port if available. See what to check when pixels flash after switching HDR modes.

The green dot stays in the same place on every color

A fixed green point that remains visible on several backgrounds is consistent with a green subpixel stuck on. A subpixel is one of the tiny red, green, and blue parts that combine to make each pixel. A test can help you observe it, but only the display manufacturer or a repair technician can confirm the panel fault.

The dot appears in a screenshot viewed elsewhere

If the mark is in the screenshot when you open it on another device, it is likely being drawn by software, the graphics pipeline, or the source image. Check the app or video where it appears, turn HDR off and back on, and restart the graphics driver or computer before considering a screen repair.

The dot disappears on another input or display

The original screen may still be at fault, but the cable, adapter, graphics output, or source device could be involved. Test the same screen with another device and the same device with another screen to narrow down which part follows the symptom.

How to fix it

1. Restart the display and computer. Turn the monitor off for about 30 seconds, then turn it on and restart the computer. This clears some temporary display and graphics glitches.
2. Check HDR and display settings. In Windows 11, open Settings › System › Display › HDR and switch HDR off, then back on to compare. On macOS, open System Settings › Displays and review the selected display's HDR option. The exact choices depend on the display and connection.
3. Reconnect the display cable. Unplug and reconnect both ends, then try another supported port or cable. Avoid changing several items at once, so you can tell which change affects the dot.
4. Check for a graphics update. Install updates offered by Windows Update or your computer manufacturer. On macOS, check System Settings › General › Software Update. Restart after an update and recheck both HDR states.
5. Try a brief pixel stimulation. The Stuck Pixel Fixer rapidly changes colors on the screen in an attempt to free a stuck subpixel. Use it only for a short period, stop immediately if you feel discomfort, and do not treat it as a guaranteed repair. It cannot fix a dead subpixel or panel damage.
6. Check warranty and return options. If the dot remains fixed, take a photo of it on a solid background and note the monitor model, input, and HDR setting. Check the manufacturer's pixel policy before opening the display or pressing on the screen.

When it's a screen fault

If the green dot stays in exactly the same place on black and other solid colors, survives a restart, and appears with more than one input or device, a panel subpixel fault is likely. A stuck subpixel can sometimes change, but a dead or damaged subpixel usually needs a panel replacement. Check the warranty or return policy first. Do not press, rub, or tap the screen, because pressure can damage nearby pixels or the panel.

Use flashing patterns with care

The Stuck Pixel Fixer uses rapid color changes, which can be uncomfortable or trigger symptoms for people sensitive to flashing light. Skip it if you have photosensitive epilepsy or are unsure whether flashing is safe for you. A solid-color inspection is enough to document the issue for a warranty claim.