D-link data switch problem?

Ok so here's the basic set up we have a D-link DIR-600 acting as a data-switch to our Thompson TG782T. We have a Sonos multi-media component connected to the D-link that we could usually play through everything before we made the D-Link a data-switch so now the problem. We can connect to Wireless through our multiple laptops on both networks but for some reason once we finished the cables we can't seem to access the router on it's ip of 192.168.0.250 but on both wireless networks we can access the Thompson gateway no problem but then here's the other odd thing that we can't see the Sonos components anymore and they're plugged into the D-link which also means that the PS3 that is also connected through the Sonos Zonebridge. So basically anyone know how to fix these problems? Any help is greatly appreciated.