If the Internet LED on the modem isn't on (while it should be) it's not a Windows issue.
If all is fine on the modem, and Windows has no connection to Internet and your smartphone has no connection to Internet and nothing has connection to Internet, either via an Ethernet cable or wireless, something is wrong with the router, modem or beyond.
So first a more detailed story?
Hey guys, hoping for some sweet release with this anuerism inducing issue we've been having! Our first Optus modem (Sagemcom f@st 3864) had its internet light turn off, and was confirmed "faulty" by an Optus deskworker (can hardly call them technical support). So fast forward to 3 days later, I buy a Dlink modem ... Same issue. Dsl light is steady green, prefect downstream and upstream connection, Internet stays off. Return it and buy a Netgear modem. Same issue! So by now we have received the Optus modem, brand new, and again no internet light comes on and the Optus pencil pusher is telling us that it's not a line issue and a $110 dollar technician will be called if we want them to investigate our wires.
I was wondering what I can do, what I can check for on my computer (far reach but can an update to Windows 10 or a setting be the blame?) would appreciate any and all help!