My new iMac won't connect to internet, will connect to network.

I have a 3 week old 2012 27-inch iMac and this morning I turned it on and it wouldn't connect to the internet. It connected to my home network just fine, just not the internet. I assumed it was my router's fault, but every other device in the house connected to the internet just fine. I have already tried turning it off and on again, many times, as with my router. I have also tried turning the Wi-Fi off and on in System Preferences. Any help?

System Preferences>Network
Click the Assist Me button.
In the next window that pops up, click the Diagnostic button & do the necessary.
http://docs.info.apple.com/article.html?artnum=106748 Mac OS X: Troubleshooting a dial-up/PPP Internet connection
http://docs.info.apple.com/article.html?artnum=106749 Troubleshooting a cable modem, DSL, or LAN Internet connection
http://support.apple.com/kb/HT1714 Solutions for connecting to the Internet, setting up a small network, and troubleshooting
BTW: Which OS are you using?

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Hi,
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I'm using the same printer with my late 2010 iMac (3.2GHz i3, 27") running OS X 10.6.7.
Took me a long while to get it to work, because I'd had it set up to work with my G4 running OS 9 via AppleTalk, and the iMac needs to connect via IP.
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You have 90 days of free AppleCare telephone support. Please give them a call right away, you can find the number by clicking AppleCare Contact Info

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Well, I'm certainly no expert at this and I'd never enable internet sharing (being too concerned about the health of my Mac and/or not knowing what untoward sites/networks/people may be seeking access), but it seems to me that having it turned on means that your computer is sharing a connection, so anytime anyone on the network seeks access, it will either wake up the Mac or cause it to stay awake. Here is an excerpt from the Help Menu (in Finder) (which has nothing to do with your question, but I found it interesting nonetheless):
If your Internet connection and your local network use the same port (Ethernet, for example), investigate possible side effects before you turn on Internet sharing. In some cases (if you use a cable modem, for example) you might unintentionally affect the network settings of other ISP customers, and your ISP might terminate your service to prevent you from disrupting its network.

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My new iMac won't connect to internet, will connect to network.

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