Self test the port 1st before you get al kahrazy.
open command promt
ping 127.0.0.1
no responce generally means the nic card is fried.
if it's unresponsive you need to
- do the disable / enable thing someone else posted
- re-install the hardware obviously
- try the repair wizard
- test the port with a crossover cable if possible (use the laptop)
- static IP
- new ethernet cable
- can you edit anything about the onboard nic card via windows?
- theres more.....
the ping thing is the 1st most basic test anyone should try before RMAing hardware though. Network testing 101. Surge protectors don't protect you from mom's and brownouts. APC battery backup will save you more fried hardware than any $400 surge protector.