So I've got an odd problem, here's the scenario: 27" iMac 2.8GHz Quad Core running OS X 10.7.1, and a netgear router (connected to a Comcast modem). It sees the network, connects then drops the network. However, with both a MacBook Air running 10.6.8 and with a Sony Viao running Windows 7, they can connect and stay connected just fine. This made me think that something with the iMac's WiFi card is broken so we brought it to work and connected it to our network (802.11x, WPA2 Enterprise, Cisco routers). It found the network and connected fine. To be sure I downloaded the Windows 8 Dev .iso (4.8GB, it took roughly 3hrs because the servers are being slammed today), and it downloaded fine without a hiccup. So at this point I'm kind of confused as to what could be causing this. Anyone have any ideas? NOTE: Could it possibly have change anything by taking it to this network, such that if we take it back home it will connect?