Should be good.
It might be a problem with windows, but I've also had several network cards that sort of sticked to the off mode.
A simple disable/enable of the network interface could do the trick.
Or, in some cases the network card can hold a current, even when the pc has been off, which could prevent the card from working normally. Unplugging the pc for several seconds could fix that however:)
These things never happened on my nvidia board however:p