Lines On Computer Monitor
Lines On Computer Monitor

Have you ever been engrossed in your work or a movie, only to be distracted by annoying stripes or a flickering horizontal line on your computer monitor? It’s not just you. Many people face this issue, and it can be incredibly frustrating.

If you’re using a computer monitor, especially with Windows 10 or 11, and you notice vertical stripes or continuous flickering, you’re not alone. This issue can be quite bothersome, but the good news is that there are several ways to address it. Let’s delve into the common problems, causes, and solutions.

Understanding the Problem

Why does my monitor have stripes or flickering lines? It’s a question that has baffled many. Before we jump into the solutions, it’s essential to understand the root of the problem.

Causes for Horizontal Lines on a Monitor

Horizontal lines on a computer monitor can arise due to various reasons:

  • Overheating or physical damage to the monitor and its cables.
  • Conflicts between the screen and the selected screen resolution.
  • Incorrect refresh rate settings.
  • Outdated device drivers and operating systems.

Step By Step Solutions To Eliminate Horizontal Lines

  1. Basic Troubleshooting: Simply turning your monitor off and on can often rectify screen glitches, including horizontal lines. Similarly, restarting your computer can resolve numerous tech problems, potentially eliminating any flickering lines on your screen.
  2. Monitor Testing: Use a different monitor to determine if the lines are a result of your computer’s screen or the computer itself.
  3. Monitor Inspection: With the monitor powered on, disconnect it from your computer. If you observe any distortions while it’s disconnected, it indicates monitor damage.
  4. Keyboard Reconnection: For computers with removable keyboards, detach and reattach the keyboard.
  5. Laptop Screen Adjustment: Close and slowly reopen your laptop’s screen. If lines appear only at specific angles, damaged wiring might be the culprit.
  6. Surface Consideration: Using your laptop on soft surfaces can lead to overheating, causing screen flickering and lines. Always use a hard surface.
  7. Software Updates: Ensure your operating system is up-to-date. Old software conflicting with new hardware can lead to screen lines.
  8. Monitor Connection: Check all cables for secure connections. If the image quality changes while adjusting the cable, consider replacing it.
  9. Electronics and Magnets: Keep other electronics and magnetic devices away from your computer and monitor. They can interfere with connections, leading to screen lines.
  10. Cleaning: Dust accumulation can cause overheating, leading to visual distortions. Regular cleaning is essential.
  11. Screen Resolution: Adjusting the screen resolution of your Windows or Mac computer can help.
  12. Monitor Calibration: Calibrating your monitor optimizes it for use with your computer and environment.
  13. Refresh Rate Adjustment: Modifying the refresh rate can alleviate lines and screen flickering.
  14. Driver Updates: Ensure all device drivers, especially those associated with your monitor, are updated.
  15. Troubleshooting Tools: Use built-in troubleshooters to identify and resolve potential issues.
  16. Factory Reset: Resetting your external monitor to its factory settings can help. Access these settings via the monitor’s physical buttons.
  17. Seek Professional Help: If all else fails, contact your computer’s manufacturer for repair or replacement advice.

Common Causes of Monitor Flickering

Before jumping into solutions, it’s crucial to pinpoint the root causes of stripes and flickering on your monitor. Here are some of the common culprits:

  • Loose Cables: Just like a puzzle with a missing piece, a monitor with a loose cable can cause disruptions in the display.
  • Outdated Drivers: Think of drivers as the bridge between your computer and the monitor. An old or corrupted bridge can lead to display issues.
  • Refresh Rate Issues: Ever heard of the term ‘refresh rate’? It’s the number of times your screen updates with new images each second. If the refresh rate isn’t synchronized with your video card, it can result in a flickering image.
  • External Interferences: Devices like routers, phones, or other electronic devices can interfere with your monitor’s frequency, leading to those annoying lines.
  • Incorrectly Installed Drivers: Your video card or monitor’s drivers might be incorrectly installed or corrupted, leading to flickering or stripes. Delete the current driver and re-install it.
  • Residual Power: Sometimes, the PC might send residual power to the monitor, causing flickering or stripes.
  • Cable Issues: Loose or damaged cables can disrupt the display, leading to a flickering image or stripes.
  • Video Card Problems: Issues with your video card, such as outdated drivers or improper connection, can cause display problems.
  • Incorrect Resolution: Setting the resolution too high or too low can lead to flickering or stripes.

Step-by-Step Solutions For Monitor Flickering

Now that we’ve identified the culprits let’s tackle them one by one.

1. Checking the Cables

Inspect all cables to ensure they are securely connected. If you suspect a damaged video cable, try using a different one. For instance, if you’re experiencing issues with an HDMI connection, consider switching to DisplayPort.

  • Ensure that all cables are securely connected.
  • Try using a different cable to see if the problem persists.

2. Updating Your Drivers

If your monitor’s drivers are outdated, updating them can resolve the issue. Navigate to ‘Device Manager’ via ‘Settings’ or the search bar. Under ‘Monitors’, select the problematic monitor, go to the ‘Driver’ tab, and click ‘Update Driver’. You can search for drivers online or use a USB flash drive with the required drivers.

  • Navigate to the device manager on your computer.
  • Locate the display adapters and right-click to update the drivers.

3. Adjusting the Refresh Rate

Ensure that the refresh rate of your monitor is synchronized with your video card to prevent flickering. Adjust the refresh rate via your screen’s settings or the Windows settings menu.

  • Go to display settings.
  • Choose the recommended refresh rate for your monitor.

4. Eliminating External Interferences

  • Keep routers and other electronic devices away from the monitor.
  • Use a shielded cable to reduce interference.

5. Eliminating Residual Power

To get rid of residual power that might be causing the flickering or stripes, turn off your PC and disconnect all cables. Press the on-off button for about 15-20 seconds. Reconnect everything and check if the issue is resolved.

6. Addressing Video Card Issues

If your video card is the culprit, ensure it’s properly connected to the motherboard. Update the video card drivers either via the device manager or the official NVIDIA or AMD website. If the PCIe slot on your motherboard is faulty, move the video card to another available slot. Always connect cables directly to the video card instead of the motherboard.

7. Setting the Correct Resolution

Ensure your monitor’s resolution is set to the recommended setting. Navigate to ‘Display Settings’ and select ‘Display Resolution’ to set it. Windows may already have detected your optimal resolution and set it for you. If it didn’t, you can easily look up your monitors optimal resolution online and set it to that for best performance.

8. Seek Professional Help

If you’ve tried all the above steps and the problem persists, it might be time to consult with a professional. Remember, it’s always better to be safe than sorry.

Preventing Future Flickering Issues

Prevention is better than cure. Here are some tips to ensure you don’t face this issue in the future:

  • Regularly update your drivers.
  • Invest in high-quality cables.
  • Ensure your computer and monitor are compatible.


Stripes and flickering lines on a computer monitor can be a real pain, but with the right knowledge and a bit of patience, you can easily resolve the issue. Remember, the key is to understand the cause and then take the appropriate action.

Horizontal lines on a computer monitor can be bothersome, but with the right troubleshooting steps, they can often be resolved. Whether it’s a simple restart, a software update, or seeking professional help, there’s a solution for every scenario.


  1. Why is my monitor flickering?
    • There could be several reasons, including loose cables, outdated drivers, or external interferences.
  2. How do I fix a flickering monitor?
    • Start by checking the cables, updating the drivers, adjusting the refresh rate, and eliminating external interferences.
  3. Can a faulty cable cause monitor flickering?
    • Yes, a loose or damaged cable can disrupt the display.
  4. How often should I update my drivers?
    • It’s recommended to check for driver updates at least once a month.
  5. Is monitor flickering harmful to the eyes?
    • Prolonged exposure to a flickering screen can cause eye strain and discomfort.
  6. Can external devices interfere with my monitor’s display?
    • Yes, devices like routers can interfere with the monitor’s frequency.
  7. What is the ideal refresh rate for a monitor?
    • It varies, but most modern monitors have a refresh rate of 60Hz or higher.
  8. How do I know if my computer and monitor are compatible?
    • Check the specifications of both devices to ensure compatibility.
  9. Can software issues cause monitor flickering?
    • Yes, outdated or corrupted software can lead to display issues.
  10. Should I replace my monitor if it keeps flickering?
    • Before considering a replacement, ensure you’ve tried all troubleshooting steps.
  11. How do I fix no signal on a computer monitor?
    • If your monitor displays “no input signal,” you might have a faulty cable or component. Restart your computer, secure the monitor-to-PC connection, or consider replacing your video card.
  12. How do I fix a monitor color problem?
    • Restart the computer, ensure a secure cable connection, adjust video card settings, or use monitor adjustment buttons.
Eric Chan

Hi! I’m Eric and I work on the knowledge base at  You can see some of my writings about technology, cellphone repair, and computer repair here.

When I’m not writing about tech I’m playing with my dog or hanging out with my girlfriend.

Shoot me a message at if you want to see a topic discussed or have a correction on something I’ve written.

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