IMac will not connect to Wifi or recognize Ethernet cable

I have an iMac running on OS X. All of a sudden I cannot connect to WiFi...and the computer will not recognize an ethernet cable plugged in. It's wierd...the Wifi will recognize networks in the area. I'll see mine, click on it and it'll ask for the password. I put in the password and it says it's incorrect (The password is defiitely correct as I have several other devices hooked up via Wifi). It wont recognize an Ethernet cable pugged in. It just says one isnt plugged in.
I did aquire a new modem/router recently (Ubee from Time Warner Cable) but no other device is having any issues...including a brand new 27" iMac...among several other devices working fine on the WiFi.
Any suggestions are appreciated. Thanks

First I would try Safe boot.
1. Shut down Mac
2. Start mac holding 'Shift' till you see the apple logo
3. Log in holding 'Shift'
4. Test there
5. Reboot
Also I would follow the steps here to create a new location:
http://support.apple.com/kb/ht2712
This will create some default network adapters and see if you can connect again

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    Step 1
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    If you're running OS X 10.8.4 or later, run Wireless Diagnostics and take the remedial steps suggested in the summary that appears, if any. The program also generates a large file of information about your system, which would be used by Apple Engineering in case of a support incident. Don't post the contents here.
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    Triple-click the line below on this page to select it:
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    Back up all data on the internal drive(s) before you hand over your computer to anyone. There are ways to back up a computer that isn't fully functional — ask if you need guidance.
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