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This can be due to faulty LCD driver IC which creates a noise bar and is shown. Check the cords to the display and also the ground connection to the display. If this is good then the IC can be faulty.
Reseating the video cable eliminate those lines that appear.
If your not familliar in tearing down the laptop, try bringing the computer to a local tech and have the video cable reseated. They can open the hinge cover/panel in order to access the video cable at the back portion of the laptop.
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.
all those sounding intelligent and saying that replacing lcd hardware will fix the problem probably didnt have the problem themseleves . i had exactly same problem with samsung syncmaster 2043swx monitor . i just restarted and booted into safe mode ( by pressing F8 key at startup ) tried changing reolution in display settings . rebooted in normal mode and asll lines are gone and never appear again . i am uisng windows Vista . so i think it is probably a driver glitch something .
yea if you cannot stand the line, one of the line's driver for that column has failed. I do not know if the cost of repair would be greater than a monitor. I have been trying to fix a handful of monitors here at work to keep busy, and I am finding that the manufactures won't even offer the repair boards. A google search for a power supply card for an aopen is how I found this board.
I was just looking at Samsung's site regarding this issue. It is most likely a line of dead pixels.
Direct from their site:
"The thin red, green, blue, white, black, or yellow line you see running through your LCD monitor is most likely a line of dead pixels. To fix this problem, you will have to get your monitor serviced or, if the monitor is new, replaced.
To set up a service appointment, contact Samsung Customer Care at 1-800-Samsung (1-800-726-7864). Have your monitor's model number and serial number on hand when you call."
http://erms.samsungusa.com/customer/sea/jsp/faqs/faqs_view.jsp?PG_ID=1&AT_ID=15336&PROD_SUB_ID=28&PROD_ID=-1
Unfortunately the LCD is going faulty.. one or more of the "Driver" transistors that operates the LCD elements RGB, have faulted ON.. perhaps this link may help fix it. Otherwise :(
http://www.wikihow.com/Fix-a-Stuck-Pixel-on-an-LCD-Monitor
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