I am the only Mac user in my house. At my father's my wireless and ethernet connections both work completely and totally fine. We are linked through a Linksys wireless router there and the ISP is Comcast. At my mom's I can only connect to the neighbor's weak signaled wireless networks. I can see my own wireless network and get good signal, but not access to the internet. I will also get a signal that my ethernet cable is plugged in, but still no internet. Her ISP is Optimum Online. Any ideas?