Computer turns on but no signal to monitor: Here’s how to fix it

Are you facing the frustrating issue of your computer turning on, but the monitor not receiving any signal? You’re not alone! This is a common problem that computer users encounter, and it can have multiple causes. But don’t worry, there’s a solution to this issue. In this article, we’ll guide you through some troubleshooting steps to help you fix the problem of no signal to the monitor. So, let’s get started and get your computer back up and running!

Causes of No-Signal:

A No Signal sign or error on your display means that your monitor can power on, but it cannot receive any input or is not able to connect to a source. With that said, there can be multiple reasons why you might be getting a no-signal error on your monitor:

  • The cable not being plugged in properly
  • Faulty display cable
  • Monitor not receiving adequate power
  • PC refusing to POST

Getting Started With Troubleshooting

Let’s rule the most obvious issues out of the way first, and then – we move on to the more niche categories where you are less likely to find trouble.

  • Reboot Your PC: Yes, we know, why reboot a PC that has just been turned on? Well, in some cases, an odd bug or glitch can lead to you not getting any signals on your monitor. Therefore, a reboot certainly wouldn’t do you any harm.
  • Tighten Your Cables: If you have an HDMI or DVI monitor since they don’t have a locking mechanism, chances are that they have been loosened. So, make sure you tighten them up correctly before you proceed further.
  • Plug-In Your Correctly: If you have just set up your PC or made some changes, chances are that you have accidentally plugged your display cable into your motherboard’s display port and not your GPU. So, make sure you’ve plugged into the right ports!

Advanced Troubleshooting

Certain points need to be checked to identify the underlying cause of the issue. Let’s discuss each one of them here:

Secondary Monitors

We’ve seen this issue happen quite often. Oftentimes, your primary monitor does not end up displaying something because that signal is being sent off to a secondary monitor. Now, wait, what if your secondary monitor has no signal either? In those cases, there’s a high chance that there’s an issue with one of your monitors which is causing all of them to fail.

So, even if your monitor used to work fine, we recommend unplugging every cable and checking your monitors one by one. Oftentimes, you’ll find that the root cause may not even be the monitor you thought was causing trouble in the first place.


There are two types of cables, a power cable to supply power and a data cable or display cable (VGA, HDMI, etc.) to provide input to the monitor. 

  • Unplug all other non-essential hardware (external camera, speakers, etc.) from your CPU.
  • Switch on the system to see if the issue is resolved.
  • See if the Power On LED of your monitor is glowing when switching on. If it is not switching on, change the power cable.
  • If you use a VGA or DVI cable, check that all its pins are intact. Sometimes the pins are broken or bent, which prevents the monitor from receiving the input signals properly from the CPU.
  • If the monitor is switching on, then replace the display cable to check if that can resolve the problem.
  • In some cases, a converter or an adapter is used, eg, HDMI-VGA converter cables. Please make sure that they are properly connected and working. 
  • If you have a spare or extra CPU, we suggest you connect your monitor to it to find out if the issue is with the monitor or the CPU. 

Note: If you’ve tried all the fixes mentioned above but still are not able to get your monitor to boot, chances are that there might be an underlying issue with either your system or your monitor. To check, plug an extra monitor (that you know works) in to find out.

Can you use TV as a monitor?

Change Display Settings:

There are some settings related to display that may not let a monitor operate properly:

  • Connect your CPU to the spare monitor and switch it on.
  • Go to Display Settings.
  • Open Advanced Settings.
  • Lower the refresh rate.
  • Lower the Display resolution – if you have set a resolution higher than what your monitor can support, it can cause your signal to bust out.

My monitor works fine when connected using VGA port, while it is showing no display when connected using HDMI?

If your monitor works fine when connected using the VGA port, but doesn’t show any display when connected using the HDMI port, there could be a few reasons for this issue. It’s possible that your HDMI cable is not plugged in properly, or it could be a problem with the HDMI port on either your computer or the monitor.

Another possibility is that the display settings on your computer may need to be adjusted to output to the HDMI port. Try checking all the connections and making sure the HDMI cable is securely plugged in. If that doesn’t work, try adjusting your display settings on your computer. If the problem persists, it may be best to consult with a technician or the manufacturer for further assistance.

One of my monitors on my multi-monitor setup is showing No-Signal. What could be the issue?

If one of the monitors is not working, the problem is surely not with the CPU. The problem could lie with one of the cables, the respective port through which the monitor is connected, or with the monitor itself. 

When I switch on my CPU, there is a continuous beep sound, and nothing shows on my monitor?

If you hear a beeping sound, that’s your motherboard telling you there’s something wrong with the internal components of your system. Generally, those beeps have a pattern that will help you identify the root cause of the issue. You can look that up in your motherboard’s instructional manual. Besides that though, if you do hear a peep, here are some pointers you need to immediately take care of:

  • Check whether your RAM is plugged in correctly
  • Make sure your PC is in its proper housing
  • Ensure that your keyboard is connected

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Few years back I started to work from home, I needed a keyboard, I researched mechanical keyboard from A to Z. After that I needed a monitor, after that I needed a mouse, after that I needed desk, chair and other accessories. I did so much research and I figured this can't all go to waste and I started writing about what I know. Keyboards, Monitors, Mouses and other accessories. You can also at WolfofTablet where I cover a lot of stuff about iPads and Android Tablets. In the free time I like to play PS5 and iOS games.

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