First, which model of Toshiba notebook do you have? Check it's bottom label- it will say "Toshiba" and have the model on it.
Then, try to update the display drivers. You can download them at www.toshibadirect.com/support. If that doesn't work, you may have an issue with the BIOS or the display itself.
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It's the connector problems. If you know what to do, I can guide you:
First, remove the screw all over the LCD case, then you can see the connector, and flexible cables. Second, remove the keyboard unit(by removing all screw on the unit), after removed, find the edge of the LCD cables, then you can see the connector.
The solution: 1.Try clean this two connector with soft brushes ( paint brush is good ), by removing the cable first,then clean the flexible connector using wet tissue ( use the alcohol ).
2. If still exist, you need to replace the flexible with new ones.
what i recommend you to test is to press behind your monitor and see that the line goes off or not.If it does..that mean you have a loose connection,it can be fix.Incase no then you have problem with your LCD.Normally if its LCD problem then you fix this problem,all you have to do is change the LCD.
Many times over years of use the thin canle that connects motherboard to monitor becomes loose very slightly but enough to create these type effects on screen.First easy test would simply be hooking up another monitor to rule out video card.Next would be looking up how to disassemble the plastic trim to expose the lcd cable then carefully disconnecting it then reseating it.If problem still exists wiggle the lcd cable see if it affects lines on lcd display if so then you probably need new cable if not then most likely an lcd screen. Screens can usually be replaced in about 45 minutes by avg.person.
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...
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.