Devices connected but no internet

[goonerben]

I have multiple devices connected to my WiFi router, but only one of them can get an internet connection. 

Had a short power outage this morning (a tripped switch in the fuse box).  When I switched back on, the router powered back up, but NO phone dialling tone (we never use the landline so not sure if this is a new issue).  

The definitely new issue is that, of all the devices that are connected to the router, only one can access the internet.   I've tried rebooting the router multiple times, restarting devices, "forgetting" the network and re-joining, all to no avail.  

One device is happily connected to the internet, but none of the others can.  

[jamesn123 · Accepted solution]

@goonerben 

Try factory resetting by holding the reset button on the hub for a minimum of 30 seconds.