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

If you’ve just gotten off a long day of work, or are planning to start but can’t seem to get your monitor to turn on even though your computer’s working, don’t worry! We’ve got the entire fix for you right here. 

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 as to why you might be getting a no-signal error on your monitor:

  • 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.

Cables:

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.

Frequently Asked Questions:

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

There could be one of the following two reasons behind this issue:

  1. Your HDMI cable or port is faulty
  2. You have chosen the wrong input source. From the menu buttons provided on some of the monitors, you have to manually select the input source. Select HDMI as the input source if VGA is selected or vice versa.

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

Conclusion

We have covered the most popular issues and some DIY tricks to resolve these issues. Most of these actions don’t need highly technical expertise to perform. But if you are not confident to play around with your setup, we strongly recommend contacting a specialist to look into the display issue you are encountering. 

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I work from home. To do the best possible job I need the right accessories - the right desk, the right chair, the right keyboard, the right monitor, etc. When I work I want to feel comfortable. I review everything that's related to home desk setup - focusing on Monitors & Keyboards.

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