Windows 10: Windows 10 Pro Unactivated After Upgrading Motherboard and CPU

I've tried troubleshooting like the website had told me to and it did not help. I originally had Windows 10 Pro 64 bit and now it says I need to activate windows.
I upgraded my motherboard, cpu, and heatsink and I used the computer for a few hours and only now the activate windows watermark popped up. I currently do not have the product key in possession.
My hard drive came from one of my old prebuilt computers and I decided to reuse it for a build.
Please help.

:)

 

New cpu+motherboard, Windows 10 Pro no longer activated.

I upgraded my cpu and motherboard today and my windows 10 Pro is no longer activated, I had no idea switching motherboards/cpus deactivated my windows 10 upgrade. Is there anything I can do without having to spend a ridiculous 200 dollars for a new windows
10?

 

Windows 10 and upgrading motherboard

Hi,



Thank you for bringing up your query on Microsoft Community.



The only hardware changes that can negatively impact activation status once you upgrade to free version are the changes to the:

• CPU
• TPM
• Motherboard replacement

The following changes are examples of hardware changes that will NOT impact the activation status:

• HDD/SSD
• Video card
• Adding extra memory

Let us follow the steps suggested by Andre Da Costa (replied
on July 26, 2015) in the following thread:



Will Upgrading Motherboard After Upgrading To Windows 10 Make Me Lose My Windows License?

Will Upgrading Motherboard After Upgrading To Windows 10 Make Me Lose My Windows License?



Kindly let us know if you need any further assistance with Windows, we are glad to assist you.

 

Upgrading Motherboard and CPU

I bought a default Lenovo K450 a few years back that came with Windows 8 preinstalled. Well over the past few months I've upgraded the PSU, GPU, and moved too an SSD without much of a hassle since I was using the same motherboard and CPU. Well, I'm moving
too a whole new upgrade and changing the case, motherboard, CPU, and adding a network card. My question is, once I've changed out all of the parts, will I need to reinstall Windows 8, or can I just install Windows 10 again like normal and follow the steps
with customer support to establish the legitimacy of my previous Windows OS? I have the OEM and Product Key.