I am not sure where to post my issue and question, but given that my problem is only observed on our Mac products running OS X 10.7.4, this seems as logical as any. Our home network uses an Airport Extreme that connects to a FIOS router. Wireless has worked perfectly for three years, until just recently. Both our iMac and Mac Book Pro ceased being able to connect to the Internet via Wi-Fi. The Airport Utility shows the Airport Extreme (and Airport Express) with the triangle and exclaimation point icon, indicating device not found. However, my iPhone and iPad (which is WiFi only) have no trouble at all finding the home WiFi network and connecting, and the lights on the Airport devices are green. Based on this, it would seem the problems lie with the Macs, and maybe some part of the OS settings. Any suggestions?