This is a very common symptom I see with bad notebook lcd panels. One day you turn on your laptop and it could be anything from one line to the whole panel is filled with them.
Why do they go bad? My theory is it's just a electronic device that can fail at any given moment. One day it works and one day it doesn't. As sad as that is electronics don't work forever.
The first thing you want to do (and what we do) is hook the laptop up to an external monitor. If it's simply a bad lcd panel the image on your external monitor should like fine with no lines. If you hook it up and see lines on the external monitor you probably have a bad video card. Usually this is a part of the motherboard but sometimes it's a separate card. In this case replacing the laptop screen won't fix your problem.
If you hook it up to the external monitor and everything looks normal the panel is bad and needs to be replaced.
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