How do I change the ethernet card in my emac desktop os-x?

After getting a new modem installed, the desktop mac does not recognize the ethernet anymore (it worked fine before!). When I plug the ethernet cable into my laptop mac, the ethernet is recognized. The Century Link tech said this means the ethernet card in the desktop is bad, and that I need to purchase a new one and install it. Problem is, I know nothing about technical stuff for computers, and am wondering the exact steps I should take. Help!!

The Century Link tech said this means the ethernet card in the desktop is bad, and that I need to purchase a new one and install it
That's prima facie evidence that guy is clueless about Macs. They're have logic board ethernet since the Late Cretaceous.
You could have a cable issue. With some modems, you need a "cross-over" cat5 cable if you connect the modem directly to the computer (in other words, you don't use a router between the modem and the computer. Not so common now but still could be an issue.
Check System Profiler again. From the left-hand "Contents" column, select "Network." If "Ethernet" show up as in this screen shoot from a much newer Mac:
then your ethernet hardware is fine and the problem reverts to Century link, their modem , or a cable problem.

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Note: If your previous payment method was not accepted, you can edit your payment type or credit card information by following the steps in this article.
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Enter your Apple ID and password, then click the Sign In button.
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Additional Information Notes
If you use an AOL screen name to sign in to the iTunes Store, editing your information on the Apple Account Information page will not carry over to your AOL account. If you need to update your AOL account information, contact AOL.
If your account information does not match your credit card, you may get a message stating "The credit card was declined."
When you update your credit card number or billing address through the iTunes Store, any equivalent information you might use with iCloud, Apple Store online, iPhoto, or Aperture is also updated.
The iTunes Store will place a minimal authorization hold on your credit card each time that you update your account information (equal to around 1 USD). The authorization hold is not a charge. The authorization hold is placed on your credit card to make sure that the information provided matches the information on file with your financial institution. The authorization hold will not be displayed in your iTunes Store purchase history.
Important: Information about products not manufactured by Apple is provided for information purposes only and does not constitute Apple’s recommendation or endorsement. Please contact the vendor for additional information.
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How do I change the ethernet card in my emac desktop os-x?

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