Can't connect to internet via ethernet

I recently lost the ability to connect to the internet via my ethernet cord. My xbox connects to the same router with no problem (via ethernet). I tried using the xbox's ethernet cord with the macbook just to see if the computer ethernet cord was faulty, but that still didn't work. All appropriate lights are lit up on the router. In the network settings, the ethernet connection shows as active and connected and shows the ip address and everything and says it's connected to my network. But I can't get to the internet. The weird thing is that for a few days, google would still work, and the results page would still work for google, but clicking any links wouldn't work (even google links). Typing in a url also didn't work. It just kept sitting there "thinking". Now it won't even connect to google. I took it over to a friend's house, and I was able to get to google and see my search results, but no other links or urls would work. Anyone have any advice for this? I have tried deleting the ethernet connection in the network settings and then re-adding it (suggested over the phone by a repair shop) but that didn't work.