I've just replaced my damaged Gigabyte board with an Asus ... identical P55 chipset so no changes were needed on the Hard Drive.
I now get a message from windows activation saying I have 24 days left to activate.
Online activation tells me the product key cannot be used on this machine.
Retyping the Product key gives the same.
It's an OEM 64-bit version installed by Evetech when I bought the original system 18 months ago. I have the original disc.
Anybody who can help ?