Ethernet is "connected" in System Preferences, but doesn't work
I am running OS X Mountain Lion 10.8.2 on a 2010 27" iMac, quad core i5 with 4gb ram. Under System Preferences --> Network, it says my Ethernet is connected, and even shows an IP Address, along with a Subnet Mask. However, I am only able to connect and browse the internet with a wifi connection. The ethernet, although "connected", doesn't connect me to the internet. Weird...can anybody help, or suggest what to do? Thanks!
iMac 27" Core i5 Mid-2010 Model