My computer will connect to wifi but not the Internet

My computer will connect to wifi but not the Internet. It's not a problem with my router because I've tried other devices on the same router and they work. I have also tried my computer on other routers and there is still no Internet connection. Does anyone know how to fix this?

Hello Bmowat,
Thank you for using Apple Support Communities!
It sounds like you are able to successfully connect to your Wifi network, but cannot get internet access.
I found this article for you named Wi-Fi: How to troubleshoot Wi-Fi connectivity found here http://support.apple.com/kb/HT4628?viewlocale=en_US
This section in particular since you have Mountain Lion installed:
OS X Mountain Lion v10.8.4 or later
Use the Wireless Diagnostics application included with OS X Mountain Lion v10.8.4 and later to identify and resolve Wi-Fi issues. For further information, please see About Wireless Diagnostics.
It is a built in troubleshooting tool to help diagnose and repair network issues and should help you resolve this issue.
All the very best,
Sterling

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    Message edited by:  CS

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