You can tell if it is the screen itself by attaching the laptop to an external monitor. If you see horizontal or vertical lines on your laptop screen or desktop monitor, the problem could be the hardware or the software. A single horizontal line has just appeared within my Lenovo T430 14” laptop screen. Modern computer monitors, typically LCD displays, offer high-definition images and a sleek form factor. If this is the case then you may need to request an RMA. I have had this laptop for a year now, and this problem only recently started to occur. While the display is blank, press the f10 key to enter the BIOS settings menu. To enter into bios screen follow these steps: Turn on or restart the computer. To prevent this, clean your device regularly with compressed air, targeting the air vents, ports and the spaces between the keys. Now, those lines have grown pretty large, and my laptop screen has started freezing. Vertical lines on your laptop’s screen can either be caused by a software problem or a hardware problem. Check if you are getting horizontal lines in this screen, If the issue persists in BIOS screen then it’s a hardware issue, Contact HP phone support for further assistance. Debris such as dirt, dust, hair and crumbs can interfere with your monitor's internal connections if you're using a laptop, causing vertical or horizontal lines on the display. LCD/LED Monitor: 1. … If there are vertical or horizontal lines on the screen it could mean that the refresh rate on your display needs to be changed. I plugged my laptop into another monitor and the horizontal line was not visible on the additional monitor. When I pull on the top left corner of my screen, though, all those problems go away and my screen becomes completely clear again. Please advise. I have an ACER Aspire 4530 laptop, and a while ago my screen started having thin horizontal lines go all across it. This could also be indicator of an issue with the panel of the display. One runs right across the screen and one is around 3cm long. If you don't have the horizontal lines when viewing on the external monitor, it is the laptop's display screen that has the issue otherwise it is a problem with the video driver chip on the motherboard which in most cases would require replacement of the entire motherboard. However, fear not as there is a pretty good chance that you will be able to fix your laptop on your own regardless of whether it is caused by a software problem or a hardware problem. I may need to replace my LCD, but I am not sure. I am having an issue with my laptop (Latitude 5480) screen as you can see below, horizontal white lines is appearing in the middle of the screen. I have the Intel HD Graphics 4000. Horizontal black lines on the screen after latest Windows 10 update Yesterday I switched on my Lenovo laptop and there were 2 horizontal black lines on the screen. The screen on my Asus looked like a TV with horizontal static lines. I have turned the laptop on & off, but it doesn't clear up the problem. Whenever I open my laptop and do anything, I would see a bunch of colorful horizontal lines on my screen. Hey!