Hi everyone, since I've changed from one ISP to another I am having problems connecting my imac to wifi. Its all setup and my phone and son's tablet are connected via wifi. Its telling me wifi is connected on my mac and I can send imessages, use viber and send/receive emails but to open webpages I have to plug the ethernet cable back in. This whole time I can still use my phone on wifi. I'm guessing it will have to do with some settings but can't work out what. I have tried using Firefox, Chrome and Safari and non of them will open the home page let alone a webpage. Can anyone help?