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Horizontal Line running down my Laptop Computer Screen

I have a Dell Inspiron 1720 Laptop Computer and I have a thin dark blue horizontal line running right down the middle of my screen. Is there a way to fix this without having to buy a new computer screen? (This happened once before and I fixed it but I forgot how!)

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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.

Posted on Oct 04, 2009

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That sounds like you have something loose ..

Here is an on-line service manual for that

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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.


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Thank You.

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Hello yoyoxide.


from my experience can be something related with the video card. I recommend you the followig (Hardware diagnostics):

-Look for one of the discs that came with your computer, it should say (Drivers & utilities).
-Boot from the CD. If you don't know how to do it do the following:
1.Insert the Drivers&Utilities Disk.
2.Restart teh computer.
3. When you get the Dell logo, press F12
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It seems that you have a pretty new laptop, so probably it's under warranty.

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Not that I've ever heard of, Usually that kind of issue is caused by blunt force trauma to the lid of your laptop......

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