Windows 10: Unable to reactivate Windows 10 after motherboard upgrade

Hi there.

I recently had a significant hardware upgrade to my PC but am still using all the old hard drives, including the one I installed Windows 10 on many years ago. I've since lost my activation key, so I went to updates & security > activation in my settings and ran the troubleshooter. I clicked the "I changed hardware on this device recently" link, but the Microsoft Account window says it is unable to activate Windows and that it can't find any linked devices that can be used for reactivating my current device. When I check my account my old PC's info is still there. Is there no way for me to resurrect my old Windows 10 license from that device, and if so why? If I can reactivate it, how would I go about doing so?

:)

 

Unable to reactivate Windows 10 after motherboard change.

I purchased Windows 8 and upgraded for free to Windows 10 when I still had my old motherboard. Now it doesn't let me reactivate it.

I followed these steps:

• Select the Start button, select Settings > Update & security > Activation , and then select Troubleshoot. You must be signed in as an administrator.
• The troubleshooter will show a message that Windows can’t be activated on your device. Select I changed hardware on this device recently, and then select Next.

After that I just get this message:

Unable to activate Windows

We can’t find any devices linked to your Microsoft account that can be used for reactivating the device you’re using right now. Make sure you’re signed in with the same Microsoft account you linked to the Windows 10 digital license
on this device or try again later.

But I am signed in with my only microsoft account and when I sign in to https://www.microsoft.com and look at my account I can see my PC's name together with my old motherboard name as a device.

Do I have to buy a new Windows 10 now or what am I supposed to do?

 

Reactivating retail Windows 10 pro after upgrading motherboard

I'm about to upgrade my motherboard and I already have my Windows 10 license linked to my Microsoft Account. Can I erase the hard drive, upgrade the motherboard, clean install Windows 10 and then run troubleshooter to reactivate with the same Microsoft account? What would happen if I use the Remove PC option in the list of devices in my Microsoft Account? Is there a way to do a remote wipe from the Microsoft account with Find My Device?

 

Motherboard change unable to reactivate Windows 10 Pro -

Out of curiosity, what does it say under Activation in Settings?