You need an application - a pixel exerciser, many applications exist.
http://www.knas.se/Applications/PixelExerciser.aspx is one.
many times it works, sometimes it doesn't... depends if there is real damage or a defect in the screen. It's free to try.
Dead pixels are shame from manufacturers. They all tolerate them (you need to have more than eight for returning). Only few manufacturers talk about free of dead-pixels. One possible solution is pressing the pixel (not so hard press) and than shutdown the screen. Sometimes it will recover frozen pixel, but if you press to much, it can make another one. If you have enough for return, it will not be so bad if you have guarantee. If you are lucky to not have dead pixel transistor, this can help. But if transistor is dead, you will not success with this technique.
Good luck!
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