Find another monitor, attach it to your laptop, hold fn key and press f5(works on most acer netbooks) if the lines still show up its most likely an integrated graphics problem, otherwise if it works you can either take off the screen and use it with the other monitor or you can replace the hardware. i can't remember what its called but a small circuit that lights up your screen could be the cause and is much easier to fix than putting in a new LCD
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