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You have the beginning of a failing Display panel, and will eventually need to replace the display.. you can hold the top left and right sides of the display screen-slightly bend forward and back, you should see the blue line either go away or it will produce more lines...
This is due to a short on the circuit board panel on the backside of the display panel that controls the Pixels on the Screen.. The Pixels are controlled In a Line Grid Fashion...
You can try changing resolution to something else and then back. You can see if your colors are 32-bit. The fact that you "fixed" it is probably an coincidence. Once you start getting anomalies like that, it usually means a new screen.
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.
This happens from overheating or from physically abusing the screen
I have an acer, which can take a lot of punishment, but i throw it around and keep it on 24/7 until it gets so hot the plastic starts to smell and melt
Awesome computer, it still works very well for the price (500$)
It developed blue lines on the screen lately and i know from previous experience acer will replace your screen as this may be a factory problem
If you're a freak like me who runs his computer all the time though, they aren't going to listen to you for one second and you have to deal with it
A) Dont use your computer as much (that sometimes fixes it) B) Buy a better cooling deck C) Dont abuse the screen (any bending or even the slightest tap can kill it) D) If the problem doesnt go away, make peace with it and get used to it E) Replace the screen (i dont want to, so now i have kewl blue lines on my screen)