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If you have External Monitor check by connecting it if you get display on external monitor without line it means Display screen is Bad, if Line appears on external display as well then there is either Display driver issue or motherboard problem.
Could be faulty graphics chip or faulty screen. If you can hook up external monitor and picture is fine then probably faulty screen. If external monitor shows same problem the faulty graphics chip. Take to repair shop and let them have a look.
Try connecting an external monitor to the Dell Inspiron 9300 and see if the vertical line is also present on the monitor. If the monitor display is fine, then your laptop’s LCD display panel is defective. If the monitor also displays the vertical line, then your problem is with either the video card or motherboard located inside your laptop. Not sure if the Compaq Presario has an external monitor plug, but if it does the above procedure can be applied to that one as well. Your responses are intended to improve the level of service provided. Please rate your experience. Thank You.
if this line is there during boot up then it is a monitor problem usually. but if it is not then it is a problem with your windows files. you could try reinstalling your windows from the disks you were given with it? otherwise i will look into it. email me if you need more help. firstname.lastname@example.org
Some of the many connections to the TFT screen panel matrix itself have have either been damaged or have decayed. These tiny connections are bonded along the edges of panel and are not viably serviceable. The most common causes are impact, stress (twisting) and condensation/moisture ingress. A replacement screen panel is needed.