Wireless connected but no internet connection on MacBook Pro

I Have recently purchased a new MacBook Pro. I updated the software to OS X Yosemite 10.10 a couple of weeks ago and had no initial issues connecting to my home internet (However I could not get onto public hotspots which I was told was due to a comparability issue with my updated Safari). Now, I cannot connect at all to my home internet. I have tried re-starting the router, re-installing the wireless network, clearing history and website data and restarting the computer. All other Apple products (iPhone and iPad) are connecting as normal.
Aa advice much appreciated - thanks!

Hi Carolyn - Thank you for responding, I appreciate the help!
We have a tower, and I don't see an on/off button. Should I just unhook the power cord from the tower? We also have the phone line hooked to the tower, should I unhook as well? I'm assuming the PC is off before I do this?
Then, turn the computer back on?
Thank you!

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My thunderbolt port stopped working on my late 2011 MacBook Pro rendering my external monitor useless--or so I thought.
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I got a brand new macbook pro 13' the other week, i installed everything etc and also my bt home hub 2 showed up in airport and it all worked fine no problem no matter where i was in the house.
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