My airport express was working yesterday, connected to the network created by my old-style airport extreme. I bought a new airport extreme, set it up, and configured it successfully (it's replaced the old airport) I'm able to connect to this network with my powerbook and have full wireless access. Unfortunately my airport express does not appear in airport utility app, so I can't set it to join the network. I'm running 10.5, have configured the base station to be 802.11n (b/g compatible) and have repeatedly powered off and reset the express. If I understand the airport utility manual correctly, the express should just appear in the left-hand pane, allowing me to configure it and access the "music" option in the menu. (music option is currently greyed out) Any suggestions please???