How to run a dead pixel test
- Wipe your screen with a soft microfibre cloth so dust isn’t mistaken for a pixel.
- Click Start dead pixel test. The screen fills with one colour.
- Click or press → to switch colours: white, black, red, green, blue and more.
- Scan the whole screen slowly, especially corners and edges. Press Esc to exit.
Dead, stuck and hot pixels
| Type | Looks like | Can it be fixed? |
|---|---|---|
| Dead pixel | Black dot on every colour (most visible on white) | No – the pixel has failed |
| Stuck pixel | Always red, green or blue | Sometimes – try the stuck pixel fixer |
| Hot pixel | Always white (visible on black) | Rarely |
Using the stuck pixel fixer
The fixer flashes random colours rapidly to “exercise” a stuck sub-pixel. Run it for 10–20 minutes. It doesn’t always work, but it’s harmless to try. Warning: do not use it if you are sensitive to flashing lights.
Dust or pressure marks vs pixels
White spots that look soft and blurry on a white screen are usually pressure marks or backlight spots, not pixels – common on older laptops. A real dead pixel is a sharp, tiny dot. Our product pages note screen marks for every refurbished laptop, so you know before buying.
Frequently asked questions
How many dead pixels are acceptable?
It depends on the manufacturer’s policy; many allow a few. For a used laptop, decide whether its position bothers you.
Can I test a monitor too?
Yes – drag this window to the monitor and start the test.
Is the flashing fixer safe for the screen?
Yes for the screen, but avoid it if you have photosensitive epilepsy.