I have a HP PC with W8.1 License (OEM) on it. I upgraded to W10.
Power Supply Blew and Took motherboard with it. Decided to replace PC. Same Model, moved HDD across, everything runs.
Windows is now not activated. Says I can't activate because my key is "blocked".
My understanding was that W10 uses the original W7/W8 License to upgrade to the equivalent version (Pro in my instance) but that it makes it independent of the hardware.
I am very reluctant to reinstall Windows 8 Fresh, install W10 fresh to get a new key, but is this what MS expects?