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What to Do if Your Windows Computer Displays Green Horizontal Lines

Flashing lines on the screen, horizontal or vertical, can be frightening. Often, our first response is to think that the computer has crashed or that the monitor has encountered an irreversible issue.

These lines are usually red, black, or green in color. Even if they look the same, their causes may be different. Below, we’ve listed troubleshooting methods you can try if your screen shows green horizontal lines. Software and hardware issues can cause this issue, so determining what is causing it is the first step.


Hardware and software problems can result in green horizontal lines on your computer screen. So, to make sure you can use the right fixes, you need to find out if the issue is hardware or software related.

Our first recommendation is to unplug your monitor cable and plug it in properly to see if that helps. If that doesn’t work, try uninstalling the driver on your monitor via Device Manager first.

To do so, launch Device Manager by continuing Win + X and selection Device Manager. Once it is open, expand the Monitors section.

If you have more than one monitor, you will find some entries here. Double-check the model name of the monitor that is experiencing the issue, then right-click that monitor and select Uninstall.

Once the monitor driver is uninstalled, shut down your PC and boot it back. Upon reboot, the monitor driver will automatically reinstall itself. If the issue is related to the monitor driver, it is expected to be fixed.

Another way to check if the problem is software-related is to boot your BIOS. If the issue is not visible in the BIOS, then it means the software is causing it.

To boot into the BIOS, shut down your PC first. Now, press the power button to boot it and press F2/Del/F10/F12 key as it begins. The key you need to keep will change depending on what PC model you have, so consult some documentation to find out who is relevant to you.

If the issue does not appear in the BIOS, normally boot Windows and proceed with one of the software-related fixes below.

If the issue appears in the hardware, you can replace the monitor cables to see if they are the cause. You can also try connecting the monitor to another computer and see if the issue appears there as well.

If you also see a green line on the other computer, a technician should check your screen to see if it needs to be repaired or replaced.

1. Update or Roll Back the Graphics Card Driver

If the issue is software-related, then the first thing you should do is perform the troubleshooting steps related to the graphics card driver installed on your system. Many users find that their monitors show green horizontal lines simply because the graphics card driver is out of date or rotten.

The easiest way to resolve graphics card issues is to update it. However, if you encounter other problems such as Blue Screens of Death and gaming issues, then your graphics card may need an upgrade and in that case, a driver update may ‘g does not move.

Here’s how you can do that:

  1. Press Win + X and click Device Manager.
  2. In the next window, expand Display adapters section and right-click on your graphics driver.
  3. Choose Driver update from the context menu.

  4. Then, click on Automatically locate drivers and follow the on -screen instructions to complete the process.

  5. Once the driver has been updated, close the Device Manager and check if the issue has been resolved. You can make a backup of the driver if this resolves the issue, so if the issue recurs, you can restore this status.

If the issue starts to occur after you have installed a new driver update, you can restore the driver to its previous version. You can do this by accessing the driver properties in the Device Manager window.

If the rollback button is grayed out, go to the manufacturer’s official website and download an older version from there.

2. Adjust the Screen Resolution

Green bars may appear if you are using the wrong resolution on your monitor. Different sizes of monitors have different ideal resolutions, so search for your monitor model online or get its user manual to find out what resolution it prefers.

If you know the resolution of the idea, do the following:

  1. Press Winning + I to open the Settings app.
  2. Go to system > exudation and scroll down to the next window.

  3. Expands the dropdown for Change the size of text, apps, and more and select 100%.

  4. Now, expand the dropdown for display resolution and select the desired resolution of your monitor.

3. Update the BIOS

Another fix that works for users by updating their BIOS. Updates like these allow the computer to correctly identify hardware components, thus resolving errors like these.

Follow these steps to proceed:

  1. Press Winning + R simultaneously with the opening of the Run.
  2. Type cmd in Run and press Ctrl + moving On + entry to open the Command Prompt with administration privileges.
  3. If you are inside the Command Prompt, type what is mentioned below and hit entry to implement it.
    wmic bios get smbiosbiosversion
  4. In the next window, note the BIOS version.

  5. Now, go to the OEM website of your device and launch the download section.
  6. Write down the details of your device and check if there are any updates available.
  7. If there is an available update, download it.

  8. Extract the downloaded file and follow the instructions in the readme.txt file to proceed.

Hopefully, installing a BIOS update will fix this issue and other minor problems within the system once and for all.

Get the Green Lines for Good

Display issues are the most frightening, as they can arise from any hardware or software issues, and if they are hardware -related, they can take some time and money to resolve. Hopefully one of the above methods has helped you fix the problem or at least identify the cause.

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