Windows 10: Find Activation Key After Hardware Upgrades

I build my own PCs and I have 4 Windows 10 licenses from upgrading 4 purchased Windows 8.1 licenses.

I have one PC that failed to acquire its License last year when I updated its hardware. I just ignored the messages since I only used it occasionally. Now I have replaced the motherboard, hard drive , video board and memory on it. I would like to properly activate it if possible.

Unfortunately, I am not sure which 8.1 license goes with which PC and I never recorded the Windows 10 license that was digitally assigned. The hard drive that was on the system when it was last activated is dead and buried.

It doesn't appear that I can see the licenses online in my Microsoft account.

Is there a way to figure this out by interrogating the PCs that are properly activated? I have an app that seems to be able to show the current Windows 10 licenses on those systems, but I have no way to associate those back to the original 8.1 licenses.

:)

 

Activation after new hardware upgrades?

Right - my point was to see what would happen if I tried the OS from one system on a totally different motherboard, and it went better than I expected, other than the activation - which I expected. I did chat with a Microsoft rep today online and he confirmed that after the hardware upgrade on a free Win10 upgrade that they (Mircosoft) will have to remote access my system to verify the proper key, etc. before they can reactivate it.

 

Important W10 activation key questions left unanswered by Microsoft

Not only that, you can check your M$ account and see what devices are listed there, so you know if you can do a clean install or not. Do the upgrade, get it activated, verify that it is listed in your account, then feel free to do a fresh install without activation issues ever.

 

Windows Will Not Activate after a hardware upgrade

I recently changed my motherboard and my processor. Heck I changed everything except my hard drive and now windows will not activate. I've done all the steps suggested in activation of windows but it is not working. The original computer was a prebuilt,
it had windows 7 on it. I upgraded it to windows 10 when it came out. Obviously I'd like to avoid having to pay for another product key if at all possible.