Horizontal Lines On Monitor Screen [Try This To Fix!]

It all started when I sat at my computer, trying to finish some work. 

Suddenly, I noticed something strange on the monitor – horizontal lines running across my screen. 

At first, I thought it was a problem with the software, but then I realized that this issue was more serious than just a technical glitch. 

As it turns out, these horizontal lines were caused by an underlying hardware issue and must be fixed immediately. 

So began my journey into understanding what causes these pesky lines on your monitors and how you can troubleshoot your monitor quickly and efficiently. 

Horizontal Lines On Monitor Screen [Try This To Fix!]

Horizontal Lines On Monitor Screen

There are a few possible causes for the appearance of horizontal lines on a monitor screen. The most common issues are the connection between the computer and the monitor, loose or damaged cables, an issue with the graphics card or video driver, a corrupted or old video driver, a problem with the graphics card, a hardware fault, and fault in the motherboard or power supply.

What do all color lines mean on the computer?

Black Lines

When black lines appear on computer monitor screens, it can be an indicator of many problems caused by either a defective video card or motherboard. 

They usually pop up in horizontal or vertical patterns and may be triggered by overclocking, outdated drivers, dust in the graphics card fans, loose or damaged cables, or general hardware issues. 

If you discover a faulty video card or motherboard that causes such lines, your best option is to replace these components immediately.

White Lines

If the monitor’s refresh rate is not compatible with the video card’s resolution settings then white lines appear on the computer screen.

If the cable between the monitor and video card is damaged, it interferes with the proper functioning of both devices, resulting in the appearance of white lines.

A damaged cable can also be caused by mishandling, or overheating from improper ventilation of your monitor.

The excessive electrical current created by electric static when working near power supply equipment.

Blue Lines

The faulty video adapter may cause blue lines to appear on your computer screen as they are a result of a defective chip in the PC’s graphics card or integrated display controller.

When there is malfunctioning within one of these chips, residual electricity has been shown to cause horizontal and vertical blue lines to appear on the display. 

Various issues such as faulty monitors or bad adapters can have these lines pop up on your screen.

Green Lines

Green lines that appear on computer screens when using a monitor commonly indicate an issue due to a loose connection at the end of the cable. 

When this occurs, there is an intermittent signal received by the port and this can lead to flickering in and out of view which results in visible green lines on a computer screen. 

By simply tightening or replacing the loose connection, you should be able to fix it. 

If instead, you see red lines that are usually prevalent with defective monitors, try replacing your monitor first as this may solve the problem for you.

Horizontal Lines On Monitor Screen [Try This To Fix!]

Here is a step-by-step process to fix horizontal lines on the monitor screen:

  1. Power Cycle Your Monitor
  2. Bad Quality Cables
  3. Input Method Issues
  4. Poorly Functioning Video Card
  5. Remove Magnets and Electronics
  6. Update Your Monitor Drivers
  7. Install The Latest Operating System Updates
  8. Not Properly Installing/Updating Graphics Drivers
  9. Using an Old Monitor With Bad Capacitors

1- Power Cycle Your Monitor

Monitor power cycling is a simple and effective solution to resolve horizontal lines on the screen. 

You can do this by turning your monitor off and then back on again to refresh the hardware components of the monitor. 

Sometimes due to the overuse of monitors, horizontal lines appear on the screen because of overeating. 

Therefore give it a break to cool down and then by powering it off for a few minutes before turning it back on. 

This will help ensure that your monitor remains in good working order with always a clear display.

2- Bad Quality Cables

Bad-quality cables are a common cause of horizontal lines on monitor screens. 

Cables that are worn out, damaged, or faulty can cause video distortion due to interference and poor signal transmission. 

Cables that are too thin or poorly shielded also make them vulnerable to electromagnetic field interference. 

If the cable is too long or has been bent sharply multiple times it can also cause problems. 

Damaged video cards can result in distorted graphics, signal interference, and other visual glitches like horizontal lines.

3- Input Method Issues

Horizontal lines on a monitor screen are generally caused by input method issues. 

An issue with the input method may be responsible for horizontal lines appearing on a monitor screen. 

This could include incorrect settings, such as incompatible refresh rates or resolutions, and even issues from connecting two different types of cables. 

In most cases, adjusting the display settings and ensuring all necessary hardware is connected properly should solve the issue of horizontal lines.

Also, faulty connections between the card and computer or problems with the physical display cables can create horizontal lines across the screen. 

Hardware issues, such as a failing video card, can cause flickering and lines to appear on the monitor screen.

4- Poorly Functioning Video Card

A poorly functioning video card typically causes horizontal lines on monitor screens. 

Video cards, also known as graphics cards, are responsible for producing the images and graphics seen on computer monitors. 

When a video card malfunctions, it can cause issues like distorted or jumbled images, frozen screens, and horizontal lines. 

Horizontal lines indicate that the video card cannot properly process the image data. To fix the problem, you must first check your video card. 

A malfunctioning video card can cause horizontal lines or problems with other components like cables or software settings might cause them.

If you have checked all of these and still can’t identify the cause, it may be a problem with the driver of your monitor.

5- Remove Magnets and Electronics

When dealing with Horizontal lines on a monitor screen, it is important to consider the presence of magnets and electronics near the device. 

Magnets can disrupt the electromagnetic field around the monitor, which can interfere with its normal operation. 

This interference can manifest in Horizontal lines appearing on display. 

Similarly, electronic devices that emit radio frequency signals may also interfere with the operation of a monitor and result in Horizontal lines.

Identifying any potential sources of interference and moving them away from the device or turning them off altogether is important.

6- Update Your Monitor Drivers

Updating your monitor’s drivers can help resolve the issue of horizontal lines appearing on the screen.

The drivers must be updated regularly to ensure that your computer is properly communicating with the monitor. 

To do this, open the Control Panel on your computer and select “Device Manager.” 

Locate the display device, right-click it, and choose “Update Driver Software” from the dropdown menu. 

Your computer will then search for available updates and install them accordingly. Once complete, restart your PC to ensure that the new drivers are properly working. 

If the horizontal lines still appear, you may need to some more steps to fix this problem.

7- Install The Latest Operating System Updates

Installing the latest operating system updates is important in resolving issues with horizontal lines appearing on a monitor screen. 

These updates can help to fix problems such as display drivers and other software conflicts, as well as improve the overall performance of the computer. 

Updating the operating system also ensures that any security vulnerabilities have been patched and the system runs securely.

Additionally, a full computer scan with an up-to-date anti-virus program can help identify any malicious programs that may be causing the horizontal lines on the monitor screen. 

8- Not Properly Installing/Updating Graphics Drivers

Horizontal lines on monitor screens can also be caused by not properly installing or updating the graphics drivers of a computer. 

Graphics drivers are responsible for controlling the video output from the computer.

So if they are not installed correctly or are out of date, it can result in visual errors like horizontal lines on a monitor screen. 

This issue is especially common with gaming PCs and laptops with dedicated graphics cards. 

To fix these horizontal lines, users should check to ensure their graphics drivers are up-to-date and properly installed. 

If the issue persists after updating the drivers, it could be caused by a hardware issue, such as a faulty monitor or bad connection cables.

9- Using an Old Monitor With Bad Capacitors

Horizontal lines on an old monitor with bad capacitors can indicate an imminent problem. 

Bad capacitors are often the result of aging, which means that a monitor that is several years old may have compromised components. 

Horizontal lines usually appear when the voltage supplied to the horizontal output transistor (HOT) fails to reach its optimal level. 

This causes the line widths to become narrower, leading to a row of horizontal lines displayed on the monitor screen. 

Horizontal lines can also be caused by loose cables and connectors, improper video settings, hardware damage due to electrical power surges, or failing components. 

If these solutions don’t work, replacing the capacitors may be necessary to solve the issue.


In conclusion, If horizontal lines appear on the monitor screen, you can troubleshoot your problem by following these steps:

  1. Power Cycle Your Monitor
  2. Bad Quality Cables
  3. Input Method Issues
  4. Poorly Functioning Video Card
  5. Remove Magnets and Electronics
  6. Update Your Monitor Drivers
  7. Install The Latest Operating System Updates
  8. Not Properly Installing/Updating Graphics Drivers
  9. Using an Old Monitor With Bad Capacitors

If the monitor still appears with horizontal lines after trying all these steps, the problem is likely with the monitor itself.

In this case, you should send for repair or replacement if it is still under warranty.


Why is there a straight line on my monitor?

Several different things could cause a straight line on your monitor. 

It might be due to a faulty cable, a bad connection between the video card and the monitor, or a defective part within the monitor itself. 

Sometimes, it could also mean dust or dirt buildup on your display screen. 

To determine what’s causing the issue, you should try reconnecting or replacing any cables.

Connect your system to its monitor and then check for any signs of dust or dirt accumulation inside your device.

How do I fix my display line?

The first step to fixing a display line is determining the root cause. 

If a hardware issue causes the line, you must assess the damage and replace any faulty parts. 

If it’s caused by driver or software issues, then updating your graphics drivers may help. You can also try reinstalling or resetting your display settings. 

Sometimes, you may need to contact an expert for further advice on fixing your display line.

Is screen tearing fixable?

Yes, screen tearing is fixable. 

Adjusting your monitor’s resolution and refresh rate can usually resolve the issue quickly and effortlessly. 

However, if that doesn’t work, you may have to update your graphics drivers or buy a new graphics card. 

Occasionally, replacing or repairing the monitor itself may be necessary to completely solve this issue.

Can CPU cause screen tears?

Screen tearing is a visual artifact that can occur when the frames displayed on a monitor are out of sync. 

It usually occurs when the graphics card outputting the image and the display’s refresh rate are not in sync. 

In some cases, a powerful CPU can cause screen tears as it sends data to the graphics card faster than it can be displayed. 

Screen tearing can manifest in various ways, such as half of the image lagging behind the other half or parts of the image being obscured by another.

What are the signs of a broken CPU?

Signs of a broken CPU include frequent and unexplained system crashes and distorted or scrambled video output.

When trying to run games or other graphics-intensive programs, excessive fan noise is also a sign of a broken CPU.

Additionally, if the CPU running at a higher temperature than normal and with slower performance than usual also indicate a CPU problem.

If your computer is exhibiting any of these symptoms, it’s possible that its processor has sustained damage and needs to be replaced.

What are the signs of a dead motherboard?

Signs of a dead motherboard include being unable to turn on the computer and no output from the monitor.

Other signs can include:

  • Missing or corrupt drivers.
  • No lights or beeps from the internal computer components.
  • Random restarts or shutdowns.
  • Burning smell from inside the PC case
  • Blue screen errors.
  • An inability to boot from a CD or DVD.
  • Distorted sound.

If these signs are present, it may be time to replace the motherboard.

What causes vertical lines on the LCD monitor?

Several factors, including bad-quality cables, an outdated driver, or a defective graphics card, may cause vertical lines on an LCD monitor. 

Bad-quality cables may be too thin or have incorrect insulation, which can interfere with the signal sent from the computer to the monitor.

An outdated driver may be unable to interpret the signal properly and cause the monitor to display vertical lines. 

Finally, a defective graphics card may be unable to send a proper signal or have issues with overheating that cause the signal to degrade over time.

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