With the new build 14371 launched to insiders today on the fast ring (6-22-2016) there is now a way to easily reactivate your windows 10 after a hardware change. The biggest change that would likely cause MS to say you are no longer activated would be changing the motherboard.
In the past, if you changed your motherboard, your windows activation would become toast (no longer valid), leaving you with the need to acquire a new license key. But not anymore with that non-sense. Microsoft finally got something nearly completely right. (cough cough)
Build 14371 and higher now allows you to reactivate a pc that has had major hardware change(s) simply by using a Microsoft Account (MSA). If you find yourself in the situation of needing to reactivate after a change follow the steps below (in nice illustrated image format).
Note: It is a very wise idea to create your MSA BEFORE doing the hardware change. Do this creation of MSA under Administrator account. This will save you a few steps and hassle
Now, on to the picture book