My wifi is connected but im stuck in an endless loop of resolving hosts.

All of a sudden the wifi on my MBP has stopped working. I have full signal strength but all browsers are unable to resolve hosts and eventually just time out. I tried clearing out my dns and using OpenDNS but both didnt seem to work. Network diagnostics also failed to resolve the issue. Any assistance provided would be greatly appreciated, thanks very much

I would first do a SMC and PRAM reset.  See this link:
http://www.makeuseof.com/tag/reset-macs-smc-pram/

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