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1. try connecting laptop to an external monitor and check if this vertical dark gray bar appears. if yes it means video is the problem. you need to boot in safe mode then uninstall the video driver. boot to notmal mode then download and install the latest video driver. if still same problem then replace video card. if video is built in with motherboard you need to replace motherboard.
2. when the vertical dark gray bar did not appear in the external monitor then it means issue is with the LCD panel. Do this turn off laptop. press and hold D key then press Power button at the same time or Press and hold on the Fn key then Power button check if the test will run. Color displays full screen when you keep pressing on N key when the colors appears check the vertical dark gray bar if still exist in the test, this means LCD panel and LCD cable needs to be replaced.
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
It is definitely a screen related issue. There are 5 drivers each running a section of the screen. Obviously one is out, but that doesn't mean the others are on the way.
You may be able to find a replacement screen if you'd like to attempt the replacement yourself. Otherwise you always have the option of using a service center.