I have no Internet connection(via ethernet or wifi) since I upgrade it to Yosemite.what is wrong?should I go back to Mavericks?

Hello!
I have a Mac mini and I just installed the Yosemite upgrade system and since then I can't connect to the internet anymore. I was using my computer also as a router for my home, abd after the upgrade my computer can't connect to the internet. It appears as it is connected to ethernet but no page can be load, and it appears the message that: this page cannot be displayed as the computer is offline. Why?? what means is offline?? And I also put the internet cable to my laptop and I share the internet, to see if it sees the wifi and the mac mini connected to the wifi but still can't connect to the internet, showing the same message as above.
So far I didn't see other problems with the new upgrads, I like the new look, but I believe is moving a bit slower and it takes too much to launch after I restart it.
My question is should I go back to Mavericks or anyone can help me with my problem?? I did reinstall 2 times the system
already and I check in disk utility couple of times...same problem, no Internet...or better say, "my computer is offline", as it says in safari window.
I really need help pleeeeeeease as I work from home and all my work is on that Mac Mini!!! And I need to downgrade to Mavericks can u please tell me how
to?!!
Thank you very much!
Sandra

Hi,
You need to sign in when using Photoshop Elements 12 as it is the method of activation. If you sign out it deactivates that installation.
If you are having problems, see if the following helps.
Sign in, activation, or connection errors | CS5.5 and later
Good luck
Brian

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