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Hi Michael Burt.
Thanks for reporting this issue in Microsoft Community.
In your description, when you connect your HP computer to another external monitor using USB-C, the other monitor does not display content.
Please take a picture of what is displayed on your external monitor and provide it to us.
Our initial judgment is that this may be related to the display selection setting of your monitor.
Please refer to the following steps
1 Disconnect the external monitor from the laptop and reconnect it
2 After reconnecting the monitor, press the Windows key and the P key on your computer to open the display options settings
3 In the pop-up window, select Duplicate to see if your external monitor returns to normal after this.
You can see the steps in the link below
How to use multiple monitors in Windows - Microsoft Support
If the above method can't help you, then it may be that the wrong configuration information file was generated during the connection process before.
Please refer to the following steps to delete this part of information in the registry
1 Search for Registry Editor in the taskbar, right-click, and select Run as administrator
2 Navigate to the following path
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\GraphicsDrivers
3 In order to prevent problems during subsequent operations, please right-click on GraphicsDrivers and select Export to save it in another path as a backup.
4 Then find the Configuration, Connectivity and ScaleFactors files inside and delete them.
Repeat the Windows + P procedure mentioned above and see if your external monitor is back to normal after this.
Disclaimer: Generally, modifying registry subkeys or work groups is intended for advanced users, administrators, and IT Professionals. It can help fix some problems, however, serious problems might occur. It can help fix some problems, however, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully For further protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. to back up and restore the registry, click How to back up and restore the registry in Windows - Microsoft Support to view the article.
If this still doesn't help, please download the driver for your graphics card or monitor from the link below, depending on the model or serial number of your device, and install it on your computer to see if your monitor can display normally after that.
https://support.hp.com/us-en/drivers
Disclaimer: This is a non-Microsoft website. The page appears to be providing accurate and safe information. Watch out for ads on the site that may advertise products frequently classified as PPC. Watch out for ads on the site that may advertise products frequently classified as PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.
If after installing the HP driver, your problem is still not resolved, please contact HP support at the link below and they will be able to provide you with more targeted assistance in this area.
https://support.hp.com/us-en/contact
Disclaimer: Microsoft provides no assurances and/or warranties, implied or otherwise, and is not responsible for the information you receive from the third-party linked sites or any support related to technology.
We hope your issue is resolved and thank you for your understanding and support.
Best regards,
Zev - MSFT | Microsoft Community Support Specialist