I have a quite thick blue line going down my laptop
I have on quite thick blue line going down my screen, that was described by some tech friends as a water leak and that it would go, however I still have it and it seems to go from one side of the screen to the other.
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The normal cause of lines across the LCD of a laptop is a damaged video
cable. The unusual cause would be the video card itself.
To determine which item is at fault, you need only attach an external
monitor to your laptop's video-out, and then swap your monitor view to
'both' or mirrored (usually just the function key (FN), plus one of the
Fkeys...look for an off-blue picture of a monitor on the Fkeys).
If the lines across the screen also appear on an external monitor, then the video card is damaged.
If the lines only appear on the laptop's LCD, but not the external
monitor, then just the laptop's internal video cable is damaged.
I know not everyone has this ability, but if you can, go to a friend's
house and hook up an external monitor to your laptop. You may need to
use the function keys to switch from LCD to external, but if the lines
go away on the external, you have a bad LCD. If the line shows up
still on the external, then your problem is either:
a) video driver (free, easy fix) b) bad inverter (video 'outputter') ...approximately $10-50/varies + labor costs to replace c) bad video card/motherboard ...usually between $200-$400 + labor to replace
Hope this helps - please be sure to rate my answer :)
This is caused by dead pixel sensors. There are hundreds of pixel sensors at the edges of the screen, when they go out it will cause a line varying in size depending on the amount of sensors that go out, and the line can vary in color, red, blue, green, white, and black. Unfortunately, the only fix for this is to replace the screen.
You can check if it is a screen or not. Connect another screen to your laptop. If you dont have anotherone you can use your friends screen or go to the nerest computer store and test one there. That way you know 100% it is the screen or another thing: video card wireing...