Blue Screen Dead Pixel Test
A blue screen reveals dead pixels as black dots, and shows stuck red or green sub-pixels clearly. Stuck blue sub-pixels blend into this background — use red or green screens to find those.
Blue screen test
Look for black dots (dead pixels) and any red or green dots against the blue background. Go full screen for the most accurate result.
Press F11 for best results on desktop
What each dot type means on a blue screen
| What you see | Type | Action |
|---|---|---|
| Black dot | Dead pixel (transistor off) | Document and check warranty |
| Red dot | Stuck red sub-pixel | Try the fix tool |
| Green dot | Stuck green sub-pixel | Try the fix tool |
| Nothing unusual | No detectable defect on blue | Also test black & white |
| Blue dot hiding | Stuck blue (invisible here) | Test on red or green screen |
Test on other colors too
Each color hides one type of stuck pixel. A complete test uses all seven colors.
Run the full 7-color dead pixel test →Frequently asked questions
What does a blue screen dead pixel test reveal?+
Dead pixels (black dots), stuck red sub-pixels (red dot on blue), and stuck green sub-pixels (green dot on blue). Stuck blue sub-pixels blend into the background — use red or green to find those.
Is this the same as the Windows Blue Screen of Death?+
No. This displays a solid blue background on your current screen to check for pixel defects. The BSOD is an OS crash screen with error text. This is a hardware display test only.
Why does a stuck blue pixel hide on a blue screen?+
A stuck blue sub-pixel emits blue light — identical to the blue background. Use red or green screens to find stuck blue sub-pixels. The black screen also reveals all types of stuck pixels as bright dots.
Do I need to test on all colors?+
Yes, for a complete check. Each stuck pixel type hides on its matching color. Dead pixels appear on all colors except black. The full 7-color test catches every type of defect.