Here is the story: I bought an airport card for my iMac, installed it, and it worked fine for about a month. (connecting via Linksys router in the next room) Then it stopped detecting my network or any of the surrounding neighborhood networks. None at all. My Powerbook still gets on my network with no trouble, as does my roommate's PC. I swapped the airport cards between the Powerbook and the iMac just to make sure the problem was not the card itself. Powerbook still fine, iMac still not seeing any networks. I've reset the router a couple of times, changed the channel the router was on, and checked and rechecked to make sure the antenna is inserted properly in the airport card. Using WPA security. Any suggestions would be really appreciated. This is totally frustrating! Thanks in advance.