If you change mobo you'll be better off with a reformat and re-installation. As for the activation, I don't think there is a limit of the number of times you can re-activate. NOt sure but why would they limit the number of re-activation. But as for that ECS mobo, the best way to find out if it's DOA is to make sure you use a known working PSU. You can test this by doing the jumper trick on the mobo power connector (green wire with any black wire with paper clip) Unmount the mobo and just install the video card and a stick of ram. Connect the power on case connector and turn on the system. It should at least POST.