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8 Solutions to Dual Monitor Not Detecting or Expanding on Windows – Ranjan.info

January 4, 202410 min read

A second monitor can be connected via a USB-C cable or HDMI port. It depends on the type of monitor, CPU or laptop model you have. Check the specifications first. Now, if your Windows computer is not detecting or extending the second monitor, you can force it or troubleshoot it using these solutions. Here's what to do if dual monitors are not detected on Windows PC.

before starting

Here are some simple steps you can take to make sure everything is in order before you start troubleshooting. Please don't skip this section as it also contains some little-known tricks.

  • Not all computers and laptops support dual monitors. Which can have multiple display ports. Check the specifications to make sure you do this and if it does, make sure you're connecting to a port that supports the second display. Also, some models have multiple display ports. If one doesn't work try another port.
  • Microsoft has Best Short Keyboard Shortcuts Windows + Ctrl + Shift + B To troubleshoot this problem.
  • Wireless display requires that both monitors be connected to the same Wi-Fi network.
  • The monitor requires a power source that is separate from the HDMI or USB-C cable you used to connect the monitor to the laptop or desktop.
  • Check the cables to make sure they are working, especially if they are old.
  • Disconnect peripherals to check if they are interfering, however, this is quite unlikely.
  • Avoid using a splitter to connect a second or third monitor. This is because it sends the same signal to both monitors. This means that you will see the same window on both screens or the window will not expand at all.
  • Check that all cables are connected properly and that the monitor light is on. Most monitors do this.
  • Some laptops and CPUs have multiple USB-C and HDMI ports but not all support extended monitors. Again, use the manual to check which one works or just watch a video on YouTube.
  • If the second monitor is not waking up after waking your computer from sleep, follow this separate guide.
  • If you are creating a daisy chain, DP 1.2 should be enabled on your first monitor but disabled on your second monitor. The steps to do this will depend on the brand and model of the monitor. If you don't know how to do this, disable HDR from Windows Settings. Check point 7 for that.

1. Turn off the monitor before connecting

Turn off both monitors and then turn it back on. Sometimes, when a second monitor is connected, Windows fails to recognize the monitor. A simple reboot helps to reset the signal or refresh the connection to the monitor, allowing Windows to detect it. There is a reason why turning devices off and on works and it is one of the first things you should try.

2. Enable Extend option in Windows

There are two ways to enable the Extend option that will extend or project the screen from the first or primary screen to the second monitor. We will share a simple keyboard shortcut for this. This is because, by default, Windows will display the monitor in mirror or duplicate mode.

Press Ctrl+P To open the project screen and select Increase Option.

Expand Monitor Options in Windows

3. Force detect second monitor manually

A common problem faced by many Windows users when connecting and extending a second screen is that the primary PC, be it a laptop or desktop, cannot detect the second screen. Maybe that's why the dual monitor is not expanding or detecting at all.

1. Press windows+i Open Settings and go to System > Display, click on multiple display,

Multiple Display Options in Windows

2. click on trace button next to Find other displays Option.

Manually Detect Other Displays on Windows

Pro Tip: Once the displays are detected and scaled, if you are not sure which display is marked as 1 and which as 2, click identify button. Your primary monitor or screen should be marked as 1. If not, you can change it here. Select the monitor and then check make this my main show Options below.

Find out the display order when expanding them in Windows

4. Check scale, resolution

For most users, the default settings are good enough. However, since dual monitors are not being detected, you can try a different scale and resolution.

1. Press windows+i Open Settings and go to System > Display, Scroll a little and you will find scale And display resolution,

Scale and resolution settings for the second monitor

2. In the screenshot above you will see 150% scale and 2560×1440 resolution. This is for Screen 1 in our case. Select the screen that is not detected. This should be Screen 2.

Change to another display in Windows

3. As you change screens, the default resolution and scale will also change accordingly. In our case, you will now see 100% and 1920×1080. Set it to the recommended level if not already. If that doesn't work, set it to a resolution that your monitor supports.

Change the scale and resolution of extended monitors on Windows

5. Set the same refresh rate

Some users experimented with the refresh rate and found that setting the same refresh rate on both monitors caused the monitor on their PC to appear larger.

1. go back to Settings > System > Display, Select Display at the top.

Select Display Monitor in Windows

2. click on advanced performance,

Advanced display in display settings on Windows

3. You can further select the refresh rate for the selected monitor Select refresh rate Section.

Display refresh rate for windows monitors

4. go back now Display And select the second monitor and make sure the refresh rate is the same as the first monitor here.

Comment: You need a high refresh rate when gaming. When browsing, writing or doing other simple tasks, a higher refresh rate isn't really needed and won't make much of a difference.

6. Update display and graphics card drivers

Since this is a display-related issue where the screen is not extending to the second monitor, updating the driver may help.

1. Squeeze windows key To open and search the Windows Start Menu device Manager, open it.

Open Device Manager from Windows Start Menu

2. You will find the graphics card listed below display adapters and both screens down keeps an eye on, Double-click to expand them.

Display adapter and monitor drivers in Windows

3. Right-click on the driver you want to update and select update driver,

Driver Update Option in Device Manager in Windows

Do this for both the primary and secondary monitors and then for the integrated and dedicated graphics cards.

7. Uncheck HDR for second monitor

One Redditor found When he extends the monitor, HDR is enabled for the second screen, but when he mirrors the monitor, HDR is disabled for both screens. So try this – either enable HDR for both monitors or disable it for both monitors.

1. To do this, go back Settings > System > Display, click on hdr,

Display HDR in Windows Settings

2. Select the display for which you want to change the HDR setting. then disable hdr video streaming Options below.

Disable HDR streaming for display

3. Now repeat the same steps for the second display and check whether your screen extends to the second monitor or not. If the second monitor is still not detected, enable HDR on both screens.

8. Delete Registry Key

If you're seeing 'Unable to save display settings' when you try to extend the display, Microsoft recommends Deleting a Registry Key. It's easier than it sounds.

Microsoft has shared the steps To do so very clearly. This will remove any saved multiple monitor configurations from your computer. So you can start afresh.

1. Press Windows + S To open Windows Search. look for registry Editor And open it by clicking run as administrator Option.

Open Registry Editor with administrator rights on Windows

2. Go down to the folder structure.

HKEY_CURRENT_USER\Software\Microsoft\MobilePC\TMM

3. Right-click the subkey or file in the right window pane and delete it. If prompted, click Yes,

More is merrier

Multiple monitor setups can help you get more work done quickly because you don't have to switch back and forth between windows. But you probably already know this. Hopefully, your dual monitors have now been detected and extended without any issues. Windows may be a little short when it comes to dual or triple monitor setups.

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