Um...i had a vertical line on my laptop screen and i just closed the screen and put a little pressure on the screen and i opened the laptop again and it was gone.....!
A line on a LCD screen (like a laptop) is caused by a faulty power connection in the screen.
Usually a entire row or column will not activate causing a black line to show. When you closed your laptop, the screen is powered down. When you opened it back up, the screen would be reinitialized and it appears that you lucked out on your issue.
When a row or column fails it is usually a permament failure that can only be fixed by a monitor technician or a screen replacement.
A similar failure can happen that causes black dots to show on the screen. These are burnt out junctions where the rows and columns meet together. The dot is commonly called a pixel.
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