- Type 1 - a stuck bright white pixel which is constantly illuminated (Hot pixels - always on)
- Type 2 - a fixed black spot which is not illuminated in any way (Dead pixels - always off)
- Type 3 - a pixel which shows up as a fixed single colour (not black or white) (Stuck pixels - one or more sub-pixels are always on or always off)
How do you check the LCD screens for Linux/Mac laptops? If these laptops have a built-in or external optical drive, you can still boot up from Ultimate Boot CD and run CHZ Monitor Test 1.01 to check.