Those lines can mean many things. Sometimes it's video card related (either hardware issues or heat) but if the line(s) are always the same, it's probably something within the LCD itself.
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Desktop * Athlon X2 4200 | 2G RAM | 160G HD | 7600GT
Laptop1 * C2D T5550 | 3G RAM | 120G HD | Intel x3100
Laptop2 * C2D T5250 | 2G RAM | 160G HD | Intel x3100
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