Hello James,
This kind of issue on Windows 10 is commonly caused by a misconfiguration with the display settings. It would be great if you can tell us more about your concern. Please answer the following:
- Did you notice any system setting changes prior to the issue?
- Are you getting any error messages?
- Can you tell us in detail the troubleshooting steps you tried? We need this information in order to avoid repeating steps.
A screenshot of the issue would be helpful. Please refer to this thread for the steps on including a screenshot in your post.
NOTE: Please do not include any personal information in the screenshot.