My macbook pro isn't connecting to any wifi. HELP?!

My macbook had all of a sudden stopped connecting to my wifi, I've restarted it and still nothing worked. I've tried to connect my macbook to other wifi's and still the same, it has a tick next to the correct wifi but says 'no internet connection' but when I go into Network it doesn't say I'm connected at all. I can connect to the internet fine when it is pluged into an ethernet cable or my USB.
Does anyone have any suggestions??

1. SMC reset
Category: Hardware power related
Instructions: https://support.apple.com/kb/HT3964
Problems solved: Machine is not booting, power button pressed and nothing happens, problems with indicators, Magsafe has wrong lights, battery is not charging, monitor and graphics issues etc. If the battery is not charged (from like letting it sleep too long), let the Mac charge up awhile first.
Other related hardware problems:
Magsafe issues: https://support.apple.com/kb/TS1713 https://support.apple.com/kb/TS4127
Check battery status: Hold the option key down while clicking on the battery icon in the menu bar, top right corner.
2. PRAM reset
Category: Hardware related
Description: PRAM stores certain system and device settings in a location that Mac OS X can access quickly. Exactly which settings are stored in the computer's PRAM varies depending on the type of computer as well as the types of devices and drives connected to the computer.
Instructions: http://docs.info.apple.com/article.html?path=Mac/10.6/en/26871.html
Problems resolved: Depends upon hardware and connected devices.

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message edited by; cs

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My macbook pro isn't connecting to any wifi. HELP?!

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