Just because you have a 'Full WiFi' indication doesn't mean your router is accessing the internet. The WiFi is just the connection between your device and the Router and can be showing as OK even if your Broadband connection is down.
Is it just 1 device or all items that cant get online eg pc no tablet yes.
Do you have any spare filters that you plug the phone line and internet cable into , these can do weird things if part of them go faulty , check them all.
You say you typed password in , its not the password you type in for a wi fi link to work , as kestrel says , its the keycode , if you lost the card its printed on the base , at least that's what I do to connect on my bt hub when I get a new device.