Dead Pixel Test

How to use this test

1. Click Start Fullscreen Test to fill your entire screen with a solid color.
2. Examine the screen carefully for any tiny dots that don't match the background color.
3. Click anywhere or press → to cycle through all 11 test colors.
4. A dead pixel appears as a persistent black dot on all colors.
5. A stuck pixel stays lit in one color regardless of the test color.
6. Press ESC to exit fullscreen when done.