I just acquired the latest iPod Touch (guess it's called 4G) and now want to access Internet via the wi-fi connection to my iMac (2.4 GHz Intel Core 2 Duo) running the latest Snow Leopard. The iMac currently has an ethernet cable directly to my DSL modem, so no problems accessing the net from there. In System Preferences I went to Network, clicked on Airport and turned it on. The Network Name field says No Network Selected. When I click the pop-up menu I see the names of lots of networks (probably elsewhere in my building, but locked). I know from the names that none of these is my iMac. I went to Sharing and I checked Internet Sharing. At the right "Share your network from:" has Ethernet next to it, but it's grayed out. "To computers using:" has Ethernet, Firewire, and Airport listed with check boxes, but again everything is grayed out. I can't check Airport. Ethernet is checked, but I can't change that because it's locked out too. BTW.. the padlock is definitely unlocked in both cases. What hurdle haven't I jumped yet??? I'm excited to get started with the new toy!!