Easy way to fix monitor not displaying by a Geek 2019

monitor not displaying image
This article provides a step-by-stop process to troubleshoot a monitor not displaying from a tech geek who has been troubleshooting this problem for decades.

There are always many ways to troubleshoot a problem (like monitor not displaying), but you want to attack this problem in the most efficient way possible so that the user can get back to work and you can get back to more troubleshooting.

So, how do you troubleshoot a monitor not displaying? The best way to troubleshoot a monitor not displaying is to follow a step-by-step process that solves the problem in the most efficient manner:

  • Make sure the monitor is working
  • Make sure the video cable is seated properly
  • Make sure the video card is working
  • Make sure that the computer has power

Try each of the following steps, when that step is positive, move on to the next step in the troubleshooting process.

  • The very first stop is to see if the led indicator on the monitor lights up.
  • If no light, then verify that the power cable is securely fastened to the monitor and the power outlet.
  • Next verify that the power outlet is functioning. This can be done by plugging another device into this outlet.
  • Next, try using another power cable that you know works.
  • Next, try using another monitor that you know works using the same power cable and outlet, if the led light now turns on, then the root cause of the problem is the monitor. 

Make Sure the Monitor is Working

The easiest way to verify that the monitor is working is to plug it into another computer that you know is working.

If the display comes on then you know that the monitor is not the issue and you can move on to the next step.

Make Sure the Video Cable is Seater Properly

If you have already plugged this monitor into another computer and it worked, then you know that there is no problem with the cable connected to the monitor.

So, you will continue following the flow of information from the monitor to the source.  You will then want to check the connection from the monitor cable to the video card.

You know that the video cable is functioning so you will be focusing on the input connection to the video card.  Visually inspect the input port and make sure that it is not damaged and that there is no debris blocking the input port.

Now that we know the monitor is working and getting power, we need to verify that the video cable is working:

  • Make sure that the video cable is properly seated both at the monitor and the computer attachment points.
  • If you still do not get an image, try swapping out the video cable with another cable that you know works.
  • If you know get a video signal, then the root cause of the problem is the video cable.

Make Sure the Video Card Is Working

So, at this point you have verified that the monitor, the cable and the connections are all good.

Now you will focus on the video card itself. Visually inspect the video card to make sure that there is no damage.

Make sure that the video card is properly seated into the computer slot.

Make Sure the Video Card is Working

If all of these points appear to be fine then your next step will be to test out another video card.  Grab another video card that you know is working and install it into the computer.

If this works, then you will know that the root cause was the video card.

Make Sure The Computer Has Power

If you are still not getting a display then you will want to verify that the power cable from the motherboard to the video card is properly connected.

If you still are not working that most likely there is a problem with the motherboard, a configuration issue, or a bios issue.

At this point, you will want to boot into the bios and make sure that the system correctly identifies the video card.

You will want to take that video card to a working machine and update the bios on the video card.

If all else fails your best bet at this point is to deploy another computer to the user.

Troubleshooting Video

The following video provides a nice step-by-step process for troubleshooting a blank monitor.

Video Tech Tip

Thanks to Linus from Linus Tech Tips for the video above which provides a very detailed step-by-step video on how to troubleshoot no post diagnosis.


  • HP provides a helpful support document on how to troubleshoot when a computer starts but the monitor remains blank on a Windows PC.
  • Apple provides the following support article to help troubleshoot video issues on external monitors connected to a Mac.
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