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The purchase of a screen LCD may be a risk, because you are not safe from a defective screen. It is possible that there is a died pixel on your screen, that is translated by a pixel represented by a red color, blue, green, white or yellow which appears on black bottom. First, UDPixel is a program which is going to help you to localize the died pixels on your flat screen, and then to try to resuscitate them by forcing them to change state very quickly over several hours. It requires a pre-installation of Microsoft .NET Framework