macbook pro shows wireless connect, but no internet

[Macnut1]

My Broadband went down for four days. After which my computer shows full wireless, but won't let me connect to the internet.
if i hook to ethernet i have the internet
connected my provider & they say it is my mac & I believe them, router shows all green lights & my printer will print from my iphone (printer wireless) My printer is connected wireless "no doubt" but my macbook isn't getting the message.
have reset everything on my mac, ip address, every option know to my internet provider. Help!