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Let's think about this. The computer is 3 years old, probably running Vista. It needs a new battery, not surprising on a 3 year old system. The screen doesn't work for some reason.
A battery & screen will run you $150-200. It may still have a problem.
A new computer with Win7 is $400-500.
I know what I would do.
This sounds similar to a fault i had with an old dell laptop... very thin vertical lines running the length of the screen. Unfortunately it was an LCD problem, the screen was kaput replacing the screen solved the problem.
To test if it is an LCD fault, simply plug your laptop into an external monitor... if you get no lines on external monitor then its a faulty LCD screen.
Is the vertical line always at one location ? (on the screen)
If so, it appears that the video card/driver (on your PC or laptop) may be causing the line to appear occasionally ... i.e. flaky ... and it will likely fail (completely) in due time. To confirm it's the video card, try using another monitor (long enough) to see if it happens.
[ The line may also be caused by "dead" pixel on the screen ... but this usually happens on randomly located pixels on the screen, not on one vertical line. But, it may also be a possibility ... in which case, using a different monitor may prove it one way or the other ]
The blue lines are a sign that the screen itself is failing. You can try to reseat the data cables from the motherboard to the back of the screen, but in most cases this is indicative of an immenent screen failure.
This is usually a screen problem and cannot be fixed however to verify if this is from the screen or from the video card you can connect a normal monitor to the back output connector of your laptop and check the display on the external screen.
This will tell you if it is the video card on the board or the actual screen. In either case it would be a hardware issue.
It is sounding like when the laptop is turned on and heats up a bit, the line appears? Sounds like one of the panels is going bad or atleast has developed a problem.
below are some tricks you can try to lessen the annoyance of the line.
Dual-Scan STN displays are composed of 2 panels behind a single protective
panel or screen. Because you are looking through the protective screen the
display appears to be one large panel even though it is not. There is
a physical separation line (gap) at the point where the two panels meet.
When the computer is on and being viewed it is not unusual to see the
visible separation line with the Dual-Scan STN displays. The line, actually
the fine gap between the display panels, appears because the color and light
pixels cannot run along the very outside edges of the panels. This line
(gap) between the panels can be seen as a fine gray line and is most
noticeable when viewing on a screen with a white or light background.
Note the line may not be as noticeable when the screen is displaying certain
colors or darker backgrounds.
It is not possible to completely eliminate the line but there are some
things you can try to reduce it's visibility.
1) Lower the display brightness/contrast. The brighter the backlight the
more noticeable the line.
2) Use Wallpapers and Screen savers that use darker colors.
3) In the Control Panel/Display applet under appearance try different
combinations of color schemes for your Window and Background choice
Let me know what happens.