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I don't have good news for you. Coloured vertical lines is a symptom of terminal failure of LCD screens. Most common in laptops, monitors, and TVs. Problem only gets worse with time with more lines appearing, then expanding to cover a whole side of the screen. 30 - 50% normally.
If you were to plug it into an external display, that will tell you whether it is a VGA uProcessor fault or a screen fault. If it is a screen fault, checkout ebay for a replacement screen. Hope that helps.
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.