Each pixel on a computer monitor consists of three subpixels: red, green and blue (RGB.) Unlike a "stuck" pixel, which occurs when a pixel has one or two of the subpixels turned permanently on or off, a dead pixel doesn't show any of the subpixel colours, resulting in the appearance of a permanent black spot somewhere on the screen. Dead pixels usually require a combination of techniques to get rid of them, and there is no guarantee of success.
Double-wrap a piece of damp cloth around the end of a blunt object, such as the working end of a pen, screwdriver or stylus. The double wrap prevents the blunt object from penetrating the monitor screen as you apply pressure to it.
Apply light pressure to the precise spot on the screen where the dead pixel resides, turn the monitor off and then back on while maintaining pressure to the screen.
Release pressure from the screen after the monitor shows the desktop and see if the dead pixel still displays black.
Open a small, black image on your desktop and click and drag the image to a position where the blackness of the image is on top of the dead pixel, rendering the pixel invisible.
Tap lightly on the spot of the dead pixel with the cloth-wrapped, blunt object. The spot will shimmer a little when you tap, producing a whitish glow. If it does not, tap a little harder until you see the shimmer.
Stop tapping after about a minute, click and drag the black image away from the spot of the dead pixel and see if the pixel is still showing black.
Download and install UDPixel from the UDPix website (see Resources).
Open the application and click the "Run cycle" button. After the cycle is completed, it will show you the location of the dead pixel on your monitor.
Click the drop-down arrow beside "Flash Windows" under the "Undead pixel" heading and choose "1." Choose "5X5" for "Flash Size" and drag the slider under "Flash Interval" from left to right until it shows (40 ms).
Click the "Start" button and then click and drag the flashing window that appears on your desktop to cover the area of the dead pixel. Let the flashing window run for approximately two hours.
If your first attempt using UDPixel fails to get rid of the dead pixel, choose a lower "Flash Interval" and try again.
Applying too much pressure to your monitor or tapping on it too hard carries a risk of damaging your monitor or producing new dead pixels.