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If you have External Monitor check by connecting it if you get display on external monitor without line it means Display screen is Bad, if Line appears on external display as well then there is either Display driver issue or motherboard problem.
Have you tried hooking it up to an external monitor?
This would ensure that it's the screen and not the video card..
If you do that and you receive a good picture then it could be something as simple as a loose video cable. Or it could also mean something like a bad video card or the expensive one, a bad screen.
Try to connect a normal desktop monitor to the laptop (there will be one vga port where you can connect the monitor) and if you see those lines on external monitor as well then most probably video card has gone bad (you can try to reinstall video drivers in this case) if those lilnes are not there on external monitor then problem is with your LCD so if system is in warranty then get it replaced other wise get in touch with local compter shop and get it replaced.
Most of the time, symptoms like those appearing on your laptop are caused by problems with your video card or the LCD screen. One of the main causes for the problem is excessive heat buildup in the laptop that damages either component, or both of them. If you have a jack for connecting an exterior monitor, try hooking up a monitor to the laptop. If the problematic lines don't show up on your LCD, that;s the component that's going bad, If they are still visible, there's a good chance your video card is going bad (or both the video card and LCD screen are going bad).
if this line is there during boot up then it is a monitor problem usually. but if it is not then it is a problem with your windows files. you could try reinstalling your windows from the disks you were given with it? otherwise i will look into it. email me if you need more help. firstname.lastname@example.org
There can be 3 possible reasons for this 1)Screen connector cable is loose. You can try to re-seat it and see if works. 2)display card problem. Connect your laptop to an external monitor and see if the problem persists. If it does not then 3)You will need to get a replacement LCD screen. Hope this helps!