Try screen calibration. you can find it in prefs. the lines may be because your device fell or experienced some kind of shock. if screen calibration still won't work try downloading powerdigi (it's not free though, you can try first the demo) it calibrates screen almost perfectly! :)
Try cleaning the sides of the screen using cloth or thin paper to remove dust. accumulated dust may cause the lines. if not, ask for repair centers though it is very costly.
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