Due to our changing security protocols on our Airport Extreme network, my 15" PB would not connect to the network. I purchased an Aria Extreme card and am having difficulty making the correct connections. I have not removed the current airport card; the instructions for the Aria said it wasn't necessary. Nothing I do seems to activate the card - it shows a green light for the activity, but I cannot seem to get it to link to the airport base station. Clicking the card icon in the finder bar only shows one usable option - Power off card. Neither Broadcom nor 802.11g cardbus options are usable. Anyone have any ideas?