Use this if Settings is unresponsive:
Type the following command (replace the X's with your key): slmgr.vbs /ipk XXXXX-XXXXX-XXXXX-XXXXX-XXXXX Press . To trigger the activation, type: slmgr.vbs /ato
A: If you have a Retail key, open Settings > Update & Security > Activation and select Troubleshoot . Select "I changed hardware on this device recently" and sign in with your Microsoft Account to reactivate your digital license. If you have an OEM key, it died with the old motherboard, and you will need to purchase a new key.
How to Activate Windows 10: The Complete Guide Activating Windows 10 is the most important step to take after installing the operating system. While Microsoft allows you to use Windows without activation for a limited time, you’ll eventually face "Activate Windows" watermarks and lose the ability to personalize your desktop.