My zd8000 is in the process of developing it's 10th vertical line. I have removed the battery and elevated the laptop to allow better air circulation and allow for better heat disapation, all to no avail. HP is not in the business of satisfying customers, no longer produces quality products, it's printers are no better than the computers. I will no longer recommend an HP product to anyone who asks which product they should purchase. If everyone who has purchased an HP product and is experiencing the same results where to do the same, it might get someone's attention at HP.
I wonder if anyone experiencing problems with HP products ever gets a satisfactory resolution. I won't hold my breath waiting for HP to step forward.
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What is happening to your laptop is the power line connecting a row of pixels is failing so only partial colors are showing up causing the vertical line. Usually screen replacement is the only answer to fix it. You can usually find replacement LCD on Ebay.
what has happened with your notebook is a simple wear factor. on the LCD screen there are ribbon cables witch join the main PCB controller head to the LCD laminated portion (what you see) have begun to wear. i have just recently replaced a screen because of the same issue. try gently flexing the the screen and see if the lines dissappear. next open the screen up, and check the cable running to the back of the screen take care as to not damage anything.
Interesting that you counted them! If you haven't tried to reinstall the video drivers, do that. If that doesn't work, hook up an external monitor to see if the display is OK on that. If it is, then your LCD screen has a problem and will need to be replaced.
In answer to your question. It may be a screen problem. as the screen has a Matrix of vertical and horizontal line configuration.
I,d suggest trying the laptop/computer on an external monitor or screen. if it works fine on an external. then it could be assumed that the TFT Panel or invertor has a fault.
if the picture/display still has vertical lines on an external monitor, then the fault may lie, with the Mainboard.
Process of elimination, before spending any Money :)