Why Does a Red Line Follow My Cursor on My Monitor When I Watch Videos Online?


What could be the cause of a red vertical line appearing on my AOC monitor when I watch videos online with my GeForce 1050ti graphics card? The line seems to follow the position of my cursor on the video player.


If you are experiencing a red vertical line on your monitor when you watch videos online, you may be wondering what is causing it and how to fix it. This article will explain some of the possible reasons for this issue and provide some solutions that you can try.

Possible causes of the red vertical line

There are several factors that could contribute to the appearance of a red vertical line on your monitor, such as:

  • Faulty cables or ports: The HDMI or DisplayPort cable that connects your monitor to your graphics card may be damaged or loose, causing signal interference or loss. The port on your monitor or graphics card may also be defective or dirty, affecting the quality of the display.
  • Outdated or corrupted graphics drivers: The software that controls your graphics card may be outdated or corrupted, resulting in compatibility issues or errors. This could affect how your graphics card renders the video and displays it on your monitor.
  • Incorrect screen resolution: The screen resolution setting on your computer may not match the native resolution of your monitor, causing distortion or scaling problems. This could make some pixels appear larger or smaller than they should, creating lines or gaps on the screen.
  • Overheating or physical damage: The graphics card or the monitor may be overheating or suffering from physical damage, affecting their performance and functionality. This could cause artifacts or glitches on the screen, such as lines, dots, or colors.
  • BIOS settings or electrical interference: The BIOS settings on your computer may be misconfigured, affecting how your graphics card communicates with your monitor. There may also be electrical interference from other devices near your computer, causing noise or distortion on the screen.
  • Possible solutions for the red vertical line

    Depending on the cause of the red vertical line on your monitor, you may be able to fix it by trying some of the following solutions:

  • Reseat or replace the cables or ports: Check your HDMI or DisplayPort cable for any signs of damage or wear, and make sure it is properly connected to your monitor and graphics card. If possible, try using a different cable or port and see if the line disappears. You may also want to power cycle your monitor by turning it off and on again.
  • Update or reinstall the graphics drivers: Check if there are any updates available for your graphics drivers and install them if needed. You can do this by using the Device Manager on your computer or by visiting the website of your graphics card manufacturer. Alternatively, you can uninstall and reinstall the graphics drivers to fix any corruption or errors.
  • Adjust the screen resolution: Go to your desktop and right-click on an empty space, then choose Display settings. Find the option that says Resolution and select the recommended or native resolution for your monitor. You can also adjust the Scale and layout settings to fit your preferences.
  • Clean or repair the graphics card or the monitor: Make sure your graphics card and monitor are not overheating or dusty, and use a fan or a cooler to keep them at optimal temperatures. If you suspect that your graphics card or monitor has suffered physical damage, you may need to contact a professional technician or the manufacturer for repair or replacement.
  • Reset the BIOS or move the monitor: To reset the BIOS settings on your computer, you may need to restart your computer and press a certain key (such as F2, F10, or Del) to enter the BIOS menu. Then, look for an option that says Load Optimized Defaults or Load Setup Defaults and select it. Save and exit the BIOS menu and see if the line is gone. You can also try moving your monitor to a different location, away from any sources of electrical interference, such as speakers, routers, or microwaves.
  • Conclusion


red vertical line on your monitor when you watch videos online can be annoying and distracting, but it may not be a serious problem. By following the steps above, you may be able to identify and fix the cause of the issue and enjoy a clear and smooth video experience. However, if none of the solutions work or the line persists or worsens, you may need to consult a professional or replace your monitor or graphics card.

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