why is there lines across my screen on my acer chrome book

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That likely means the LCD screen is starting to fail. It could be a graphics core issue. The easiest way to determine which one is to connect the laptop to an external monitor / HDTV to clone the desktop. If the desktop does not show the lines, then the problem is the LCD screen. If the monitor does show the lines, then it is the graphics core that is the problem.

My guess is that it is the LCD screen.
 
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