I realise this is a royal pain in the @rse but I would have tried staright after the clean build before I put anything on including itunes and AV to see if it picked up the pod as a device/disk, then checked after installing AV then itunes to see where the issue is but that is a rebuild for you. Do you have access to another usb cable. Another thought is my ipod touch really doesnt like USB hubs so straight into a mobo usb port