My MacBook can find my wifi says it has perfect signal and it's connected. But there is no internet and I've have had this same problem at my house my friends and wifi source I use. Has anyone had this problem or can help me with this thanks

i have a MacBook pro. I'm trying to connect my Mac through wifi at my house, it shows my router says it's connected with full signal yet I have no internet. So I thought I would try it at my friends house but I had the same problem. the Internet connection and wifi were on, as our iPhones were working through wifi. And my friends Mac works via wifi at my house. Just mine dosnt has anyone had this problem or can help me with this problem thanks.

Try this.
    Power off the router. Unplug it from the wall. Wait a while.
    Plug it back to the wall. Power the router on. Wait until all the lights are lit properly. It will take a while.
    Restart the computer.
    Start up in Safe Mode.
    http://support.apple.com/kb/PH14204

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