You can try connect the notebook to any external desktop monitor available and check the display. If you don't find the lines in external monitor, you can confirm that it is a LCD issue.
If you don't have any external Monitor with you, you can start the notebook and keep on tap F10. You will get BIOS Setup Utility. You can check whether the lines are present or not. If you find the same lines in BIOS setup utility screen, the defnitely we can confirm that it is a hardware issue with the notebook LCD. At that point, you can use your notebook factory warrenty and send the notebook for free mail in service.
If you don't find the lines in BIOS, then it is a software issue. Just reinstall the Video Drivers and that may resolve the issue.
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Either you can hook up an external monitor or access BIOS setup (Basic Input/Output System) to replicate if the horizontal line appears. This step will check if the problem is with the video card or the LCD.
If you get the horizontal line on the BIOS or never get it on the external monitor, then surely the LCD screen is beginning to fail. You need to reinsert and/or replace the LCD inverter or LCD itself.
However, if you see the horizontal lines on the external monitor but not on the BIOS, try to update the video driver. If this will not resolve the issue, you need to replace the video card or the motherboard of your laptop.
It can be hardware issue with your monitor so to confierm it .... disconnect the VGA & power cable from the back of the pc and press & hold the power button of the monitor for 10 secs ...replug the cables and turn on the monitor .....as well as turn off your pc and restart in BIOS page if you still find Horizontal line its the problem with the monitor but if you dont get any Horizontal lines problems with the display drivers .... try to uninstall , reinstall and update the drivers .....
A horizontal line on your LCD display is either caused by the video chip on your system board or the LCD screen itself. Either way it will not cause you to lose data on your hard drive. It is a video problem.
By connecting an external monitor from a desktop PC to the back or side of your notebook and switching to it by using your function keys (see manual), you can see if the problem is also on the monitor (meaning video chip problem) or stays only on the notebook LCD (LCD problem).
The video chip problem means you will need a system board. The LCD problem means you will need a new LCD panel. In rare cases, reseating of the ribbon cable on the back of the LCD panel will fix the red line.