Sonos Play 3 not connecting

[Gvine]

Hi,

I have just bought a new Sonos Play 3 - it's connected via an Ethernet to the router (Netgear DGN1000). It was all working fine initially.

Now when I try to connect the Sonos system it cannot be found by my computer. I have rebooted and disconnected the Sonos several times. Even though it is connected to the internet router via the Ethernet cable it doesn't seem to be registering. I have also tried re-setting to factory settings and it is still not connecting.

Any ideas??

Thanks