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why the HP Pavilion 15-n203ex isn’t listed in the before menu i wanted to know how to fix the small vertical line that appears in the left side of the screen

mehmesha2011, " vertical line that appears in the left side of the screen" sounds like a Tab error. Of course this is strictly going by your description. Post an image with your question so we can see what you see. Here is the guide for that. If it is a Tab error as I suspect, than the only way to fix it is by replacing the LCD.