Ethernet Port failure on Acer Aspire T180-GB7Z

Ok, so recently (about three weeks ago now) there was a lightning strike directly overhead that shut down my modem, and, after getting a new one, my computer functioned fine for 1 day and now the modem fails to recognize it vie the ethernet port, but works fine with my x-box 360 and laptop. I have tried switching ethernet wires, and it makes no difference. The computer itself says everything is functioning correctly.
What do I do to get the ethernet port working again with my P.C?
Many Thanks

Type of your O.S (Operating System) Windows, MAC, Linux Etc?