looking at the mobo, the KT400A chip at the bottom, rear connections facing away from you, there's one or two little tiny thumb sized chips in the upper left corner, need numbers on those
they could be 3com,via, or rtl or realtek from what im reading
in other words, open your case, if its a standard tower type case and the left side when facing the front comes off to allow access, look in the lower left corner of the mobo.......