Macbook pro has wifi connected but won't open internet - says computer offline - works fine on ethernet and other pc's

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Any ideas on how to resolve this issue - wifi is connected but the web browser won't open - gives message that computer is offline. It works fine on ethernet and also on other computers in house. no other modem or devices in home.
computer one year old.

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He advised me to 'back up' everything and 'reformat' the computer.
I have been looking at how to do these tasks - not 100% on both.
The quickest way to do this is to create a clone copy of your existing internal Macintosh HD. You can create this copy using applications like Data Backup, Carbon Copy Cloner, or SuperDuper!.
I use an external USB HDD for the clone copies.
The following AppleInsider article will give you an idea on how to use Carbon Copy Cloner to make a clone backup of your Mac's hard drive.

November 30, -0001

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