This is so weird. My mom has a new pc in her room that does not have wireless. I told her that we could run a ethernet cord from her computer over to her new pc and use internet sharing. Well this would have worked, but as soon as a plug in the ethernet cable (sharing on or not), OS X seems to be unable to resolve any addresses. If I go to a local IP, it works fine. (But that takes no DNS) Any ideas? I know I've done this before with no problems. EDIT If possible, how do I downgrade my mom's mac to a lower version of OS X?