My MacBook Air late 2010 worked perfectly before the Mountain Lion upgrade. After I updated to Mountain Lion, the Internet stopped working on my WiFi network. It detects the network and connects to it with no problems, but cannot access the Internet. On my home network, my Windows 7 PC, iPhone, and iPad all connected to the Internet with no issues. I took the MacBook Air to a local reseller and they connected to their WiFi network and it works perfectly fine. I also connected to other public networks and it works fine as well. I also brought it to work and it works perfectly too. Just no internet on my home network. I tried disabling the firewall, but that didn't help.
closed as not a real question by bmike♦ Apr 30 '13 at 14:42
It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.