Q: my wifi shows connected but I can't get online

    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

    For more help;

    https://support.apple.com/en-us/HT202663