You have a computer which supports two monitors and have them configured for “clone” mode, and you do not have the display configured to use Windows Aero. When playing a DVD movie, an artifact called “tearing” may appear on the secondary monitor. Tearing is a video artifact in which the top portion of the screen shows a different frame of video than the bottom portion. During scenes containing fast motion, there may be a noticeable horizontal line at the point where the two frames meet.

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