My mac wont connect to the wifi network but all other devices are working fine! Please can you help

My Mac wont connect to my WiFi.  It can see the network but has an "!" over the WiFi signal. My iPhone and Surface connect fine.  My Mac was working fine yesterday.  I've restarted the rooter, the Mac and still not luck.  I've changed the WiFi channel, removed and re-added the WiFi network, but I still can't connect. Please can someone help.... thank you !

Power Cycle
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?viewlocale=en_US

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