Windows OEM SSD to Another MOBO

May 24, 2018
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I have two problems so I'll explain as best as I can
BACKGROUND: I built a gaming PC and bought a Windows 10 OEM license to INSTALL on my SSD a few years back as I had budget constraints and it was cheaper. Now I'm building a new computer with an entirely new motherboard. I plan to keep my SSD with the Windows 10 OEM installed and just buy a HDD with Windows 10 installed off the internet to slap into my old so it's easier to sell.

Problem 1 - Old System New HDD: I plan to buy a 500 GB HDD with Windows 10 on it to slap into my old gaming PC so it's ready to sell to my friend. However since my first gaming PC I built with Windows 10 OEM on an SSD will I be able to just play the HDD in with no problems or will I have to buy another windows key?

Problem 2 - New System Old SSD: Since I have an SSD, one with both the Windows 10 OEM and personal files, I wanted to keep I'm taking it out of my old system to put in my new one. When I finally build my new computer will my SSD with Windows 10 OEM installed work on my new build?


So will my HDD and SSD work on both builds and if so will I have to buy another license?
 
Solution
Problem 1: No idea, since I have never bought a HDD by itself with Windows on it.

Problem 2: I have done that several times successfully.
I removed all drivers and software connected to old hardware (Motherboard, GPU, etc) from Device manager and Programs, then power off, remove disk and connected to another build. Windows installed drivers and rebooted a couple of times.
It two occasions I had to use Microsoft automated system to activate the PCs
 


1. You cannot use the same license on two different systems.
You can't transfer that license to the new system, and continue to use it on the old system. You need 2 individual licenses.

And don't buy a drive with an OS already installed on it. That is NOT valid.

For moving that license to the new system...
Read and do this before you change any parts:
https://support.microsoft.com/en-us/help/20530/windows-10-reactivating-after-hardware-change
http://www.tomshardware.com/forum/id-3164428/windows-build-1607-activation.html

2. Moving that SSD with OS to a new system:
There are 3 possible outcomes here.
1. It boots up just fine
2. It fails completely
3. It boots up, but you have lingering issues later.

Anyone who says it always works simply has not done it enough to see it fail completely.

Prepare for a full reinstall in the new hardware. Be thankful if it works.
But do prepare for a full install.
 
Solution