Test your monitor for dead or stuck pixels

We suggest cleaning your display with a soft fabric prior to beginning the test. After starting the test, your screen will display a single color. Use either the left mouse click or the space key to cycle through black, white, red, green and blue. To exit the test, simply press the esc key.

Since pixels are extremely tiny, closely inspect all the test screens. Allow your eyes some time to adjust to the screen's brightness.