Windows 10: My old motherboard and hard drive died, how can I activate windows on my new system using...

So I had a machine with windows 10 activated, genuine copy of windows. But that machine died and I had to start fresh on the motherboard and hard drive. This means I am not able to go back into my old system to find my product activation key. Is there an activation key that was attached to my microsoft account somewhere? Or can I get a replacement key somehow? please help!

:)

 

new system old hard drive...

I have an old hard drive that has those old ribbon connections to transfer data to the mother board.

I have a new computer that mostly uses those cool little ATA (I think that is what they are called) connections.

The new computer has a Vista OS.

I opened up the case and I was supprised to see on the motherboard a wide ribbon connection and so I connected the old hard drive and a free power connection.

When I turned on the computer, the system started up like usual and did not notice the new hard drive.

I went to the Control Pannel and did an automatic add hard drive call and it did not find the old hard drive.

Any suggestions?

 

Boot from old hard drive

The motherboard of my old computer died suddenly and so I bought a new computer. It has two 1TB HDDs on RAID 0 and comes preinstalled with Windows 10 Home. I wanted my computer to boot from my old 120GB SSD from my old computer but it doesn't seem to recognize it as boot drive. It was working perfectly with my old computer.

I can view files from the SSD and so this confirms that it is working. The boot partition is marked active.

I tried changing the boot hard drive in the bios but in the bios, the only two options shown in the boot menu are

• Windows Boot Manager (Intel Volume1)
  
• CD/DVDRW
  

After searching online, a website suggested swapping the Sata of the old hard drive with that of the new one. I tried even this but this didn't work either. It gave me the error "boot disk not found" and in the boot menu, the only option was "CD/DVDRW".

For Reference :

Motherboard : ASUS Z170 PRO GAMING

All Hard Drives Run GPT.

Any other solutions?

 

Old hard drive from computer that just died to new computer and now activation problem.

The computer I took the hard drive from was activated. It had been 8.1 and I did the free 10 upgrade. Then it died. I had a clean 10 install done on the new one to get rid of the previous owner's data. I just wanted to install all my programs and data
on this new one. Another person in Microsoft Community had told me to make a system image before my old one died. I did that on a WD passport USB drive but couldn't get the system image to install on my new computer. That's why I put my old drive in the new
computer.