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First, you need to verify if the dot is cause by faulty graphics chip/card or LCD/LED. To do this use external monitor, if you cant see dot on your external monitor then you have faulty LCD/LED if you see dot like in your laptop the you have graphics chip/card problem.
You have not mentioned the make/model of the set but universally if the blurring are coming in you might havea display fault. But if thefault is white lines it can be errrors in the display drivers.
If the PC is under warrranty - 5 months - then you can claim for warranty to replace the display.
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.