I have an ACER Aspire 4530 laptop, and a while ago my screen started having thin horizontal lines go all across it. While the display is blank, press the f10 key to enter the BIOS settings menu. 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 turned the laptop on & off, but it doesn't clear up the problem. To enter into bios screen follow these steps: Turn on or restart the computer. Now, those lines have grown pretty large, and my laptop screen has started freezing. 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. 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. This could also be indicator of an issue with the panel of the display. I have the Intel HD Graphics 4000. I have had this laptop for a year now, and this problem only recently started to occur. When I pull on the top left corner of my screen, though, all those problems go away and my screen becomes completely clear again. Hey! The screen on my Asus looked like a TV with horizontal static lines. If there are vertical or horizontal lines on the screen it could mean that the refresh rate on your display needs to be changed. Please advise. If this is the case then you may need to request an RMA. 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. I may need to replace my LCD, but I am not sure. I plugged my laptop into another monitor and the horizontal line was not visible on the additional monitor. … Modern computer monitors, typically LCD displays, offer high-definition images and a sleek form factor. Whenever I open my laptop and do anything, I would see a bunch of colorful horizontal lines on my screen. Vertical lines on your laptop’s screen can either be caused by a software problem or a hardware problem. 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. To prevent this, clean your device regularly with compressed air, targeting the air vents, ports and the spaces between the keys. If you see horizontal or vertical lines on your laptop screen or desktop monitor, the problem could be the hardware or the software. 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. You can tell if it is the screen itself by attaching the laptop to an external monitor. LCD/LED Monitor: 1. A single horizontal line has just appeared within my Lenovo T430 14” laptop screen. One runs right across the screen and one is around 3cm long.