3. Windows 10 Screen Flickering Black and Graphical Glitches I recently purchased a new laptop and installed Windows 10 on it. If the flickering is still observed then the problem may be because of the monitor. HDMI/VGA/DVI Cable. NOTE: You may have to press an "external monitor" button. Although the new monitors are far more reliable than the old CRT technology, it is still possible for them to develop a flicker. A flickering LCD monitor is more than just an annoyance. ... and display card(2 years old). CAUSE: Another thing that you need to check is whether the image still flickers on disconnecting the video input to the monitor. When I am using windows 10, and an action (moving cursor, opening windows) happens, black lines start flashing on my screen (at random positions, vertically). SOLUTION: In this case, you can try changing the monitor and then checking the issue. If you can see fine on the external monitor, then your attached display, or the ribbon cable that connects it, are your problem. 3. The first thing you should check when you start seeing lines on a monitor screen is the cable that you use to connect to it. Turn on the laptop. Disabling G-SYNC completely resolves the issue. See, I have this barely-used 32' LED monitor, and it has a very simple, very strange, very annoying problem: It flickers slightly whenever the screen is mostly dark. My monitor started showing flickering vertical lines across the whole display. The floating dialog box should appear on-screen (against a black background), if the monitor cannot sense a video signal and is working correctly. You might see pins that have broken or pins that are bent out of place. Could be the f4 button or a button with two monitors on it, for the external monitor to work. When I say "mostly dark", I mean, dark or cold colors - or even, if I lower the brightness/gamma/contrast to the point of darkening what is in the screen, it starts flickering again. TLDR: Monitor vertical lines flickering and ghosting to an almost epileptic degree, tried almost everything. Make sure you have it set up correctly. Thus, I think bad contact old rams can cause display flickering. 4. The entire monitor will flicker black randomly (varying intervals), this happens regardless of what is being displayed (full screen games, windowed, desktop, etc.). It's most noticeable on grays and darker colors, and less noticeable one whites. Turn on the external monitor. Black vertical bars blocking the sides of the screen … How to Fix Vertical Lines on the Computer Screen. While in self-test mode, the power LED remains white. 2. It only lasts a split second but is very annoying particularly when it does it in quick succession. I … Using a 4K monitor? It seem LCD flickering lines solved. Everything worked fine for a couple of weeks then what I can only assume was an update has caused my laptop to go crazy. Examine it closely to see if it’s damaged. Disconnect the video input to the monitor. Monitor flicker, unfortunately, hasn’t followed CRT monitors onto the ash-heap of history. Vertical lines running through your computer monitor can be disrupting during use: they can often be removed by properly configuring the computer and making sure the connection doesn't have any problems. It can cause eye strain, headaches, and a host of other ailments, especially if you spend a great deal of time in front of your computer. Luckily, there are some steps you can take to stop the flickering and avoid these problems.