The lines appearing on your LCD means it has a defect on the screen.
There are 3 types of pixel defect
1) dead pixel - pixel is always off
2) stuck pixel - pixel is always on
3) hot pixel - pixel is on but in red, green, blue or yellow, can also be a light black color
You can try to fix stuck or hot pixels but dead is dead.
1st method, flashing different colors rapidly:
JSScreenfix.com has a great tool. This is their
free java applet or you can download it below.
2nd method, applying pressure to pixel:
Damp paper towel, Small stylus or dull pencil.
3rd method, tapping the pixel:
Pen with cover on or another small, blunt object.
If your laptop is still under warranty, get it replaced. If not you are looking at the most expensive part in a laptop to get replaced. (LCD screens on laptop is roughly equivalent to 40-60% of the total laptop cost
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