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It could be a couple of different things. To figure it out you'll have to use your mouse. Just roll your mouse over it, if you see a break in your mouse's outline then you're probably looking at a bad LCD with a bad line, if you see the line break up around the mouse then you're probably looking at a bad graphics processor/card. Either way it's going to be a hardware issue that's not easily resolvable and, unfortunately, you may just have to learn to live with the line. Feel free to respond with any additional information.
1) Borrow a external monitor and connect to the laptop 2) If the white line can be seen on the external monitor the fault will lie with your graphics card.
However i suspect you will see no line and the fault is with the screen or more likely the cable going from your motherboard to your screen, if this is the case you will need to book in to a reputable pc store for repair
That cannot be repaired as the screen on your notebook has layers and between those layers gas is compressed within thin columns. In your case your screen got a minute leak in one of the columns and now that column is unable to produce image. Hence, It can't be repaired. You have to change the entire screen.
Yes, your screen most likely is going bad, the only other reason for lines and distortion is a loose data cable that runs up the back of the lcd panel on the left side. For the touchpad, go to the control panel > Mouse > look at the top of the window and look for the device properties. open this tab and look for your touchpad listed. Highlight it and click on the settings button. Go through these settings and make sure that tapping is enabled. Even if it is, you may consider updating the drivers for the touchpad.