Yesterday fine, today no internet it says problem with router. 3 other devices connected to same router and they work ok, its a Lenovo Yoga, WiFi only no ethernet socket. Tried usb WiFi adapter I have, sees it connects to it. Sees all available signals connects to mine then same as before. Connected to the pub WiFi signal, different provider, then says no internet. So it appears that even though it can login in to an access point, it cannot then use it. Tried windows diagnosis and tried running in safe mode. No difference. Any ideas? Bin job?