Why does my macbook say theres wifi but says no internet connection

can someone help me fix my wifi because it says no internet connection but shows full  wifi bars. every other apple product is working

Change your router channel number.  Most times this works & is all you have to do.
See KB Articles:  http://support.apple.com/kb/HT1401 AirPort troubleshooting guide
http://support.apple.com/kb/HT2712 Using network locations in Mac OS X
Manually provided DNS server addresses are higher priority than DHCP's
http://support.apple.com/kb/HT1714 Solutions for connecting to the Internet, setting up a small network, and troubleshooting
============================
System Preferences>Network
Click the Assist Me button.
In the next window that pops up, click the Diagnostic button & do the necessary.
Also, run the Airport Utility app which is located inside the Utilities folder.
=====================
If using a  Linksys router, contact LinkSys Customer Support and/or post in their forums.
If using Apple's Airport, please re-post over in one of the AirPort Forums.

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