Sonos uses its own private wireless network. It will ignore WiFi and WiFi will ignore Sonos.
The Sonos units always use DHCP, other than changing the RF channel, there are no network configuration options. If the Sonos units cannot find the DHCP server, they'll go into AutoIP mode. If the music storage will join the AutoIP group, the Sonos system can be controlled by the Sonos handheld controllers and it will play local music, but it will not be available to a Pronto or any computers not in the AutoIP group.
At least one Sonos unit MUST be wired to the router for a fully functioning Sonos system.
If the OP's Sonos wired connection failed, this could explain the symptoms.
Don't overlook the possibility that a duplicate IP address is conflicting with the ZP90.
Last edited by buzz on October 17, 2010 04:43.