How to fix computer monitor no signal

Last Updated: Feb 3, 2024 by

If you’ve ever turned on your computer and been greeted with a blank screen and a “no signal” message, you’re not alone. This frustrating issue can be caused by a variety of factors, from simple cable connections to more complex hardware problems. In this article, we’ll explore the common causes of a computer monitor no signal and provide troubleshooting steps to help you fix the issue.

What Causes a Computer Monitor No Signal?

Before we dive into troubleshooting, it’s important to understand the potential causes of a computer monitor no signal. Here are some of the most common reasons why your monitor may not be receiving a signal from your computer:

  • Loose or faulty cable connections
  • Incorrect display settings
  • Faulty graphics card or motherboard
  • Outdated or corrupted drivers
  • Hardware conflicts
  • Power supply issues
  • Faulty monitor

Now that we know what could be causing the issue, let’s explore how to troubleshoot and fix a computer monitor no signal.

Troubleshooting Steps for a Computer Monitor No Signal

Step 1: Check Cable Connections

The first step in troubleshooting a computer monitor no signal is to check all cable connections. Make sure that the power cable is securely plugged into both the monitor and the power outlet. If you’re using a VGA or DVI cable, ensure that it is properly connected to both the monitor and the computer’s graphics card.

If you’re using an HDMI or DisplayPort cable, try unplugging and replugging it to ensure a secure connection. It’s also a good idea to check for any visible damage to the cables, such as frayed wires or bent pins.

Step 2: Check Display Settings

If your cable connections are secure, the next step is to check your display settings. Sometimes, the issue can be as simple as the display being set to the wrong input. Use the buttons on your monitor to cycle through the available inputs and make sure the correct one is selected.

You can also check your computer’s display settings to ensure that the correct monitor is selected as the primary display. If you have multiple monitors connected, make sure they are all properly configured in the display settings.

Step 3: Update Drivers

Outdated or corrupted drivers can also cause a computer monitor no signal. To check for driver updates, go to your computer’s Device Manager and look for any devices with a yellow exclamation mark next to them. This indicates that there is an issue with the driver.

Right-click on the device and select “Update driver” to search for and install any available updates. You can also visit the manufacturer’s website to download and install the latest drivers for your graphics card and motherboard.

Step 4: Check for Hardware Conflicts

Hardware conflicts can occur when two devices are trying to use the same resources, such as the same IRQ or memory address. This can cause issues with your computer’s display and result in a no signal message on your monitor.

To check for hardware conflicts, go to your computer’s Device Manager and look for any devices with a red “X” or yellow exclamation mark next to them. This indicates a conflict that needs to be resolved. Right-click on the device and select “Properties” to view the details of the conflict and resolve it.

Step 5: Check Power Supply

A faulty power supply can also cause a computer monitor no signal. If your computer is not receiving enough power, it may not be able to properly send a signal to your monitor. Check the power supply unit (PSU) to ensure that it is functioning properly and providing enough power to your computer.

Step 6: Test with a Different Monitor

If you’ve tried all of the above steps and are still experiencing a computer monitor no signal, it’s possible that the issue lies with your monitor itself. To test this, try connecting a different monitor to your computer and see if it receives a signal. If the second monitor works, then the issue is likely with your original monitor and it may need to be repaired or replaced.


A computer monitor no signal can be a frustrating issue, but with the right troubleshooting steps, it can usually be resolved. By checking cable connections, display settings, and updating drivers, you can often fix the issue without needing to seek professional help. However, if the issue persists, it may be time to consult a technician or consider replacing your monitor. With these tips, you can get your computer up and running again in no time.

Gulrukh Ch

About the Author: Gulrukh Ch

Gulrukh Chaudhary, an accomplished digital marketer and technology writer with a passion for exploring the frontiers of innovation. Armed with a Master's degree in Information Technology, Gulrukh seamlessly blends her technical prowess with her creative flair, resulting in captivating insights into the world of emerging technologies. Discover more about her on her LinkedIn profile.