Do I need (or do I even have) a NIC card? Modem works, comp not responding

Hi All,
Recently we have been experiencing connection problems with our cable modem and Mac. We've had our cable company out several times and I finally believe they have resolved any problems on their end.
Currently all of the cable modem lights are on (normally indicating we should be able to connect) and we are still not connecting. During a phone call to one of our cable techs he asked me to pull up System Preferences and click on Network. Upon doing this I then,under the "Show" drop down menu chose "Network Status". He and I were both surprized that the only thing that showed up in the dialog box was Internal Modem. There was no "Built in Ethernet" which is how our modem is connected to our Mac. He said that Built in Eternet should be there and that I need to get a new NIC (Network Interface Card) to resolve the problem so that the computer can communicate with the modem. Makes sense to me.
My question is this: Is there such a card for a Mac or was he referring to a PC type of card that performs that function. From my converstion with him he is obviously somewhat conversant with Macs (or had good scripts,prompts to read from) so I left our conversation thinking he knew what he was talking about. Is this a piece of hardware or software? I got the impression from him it was a piece of software that needed to be reinstalled. Lastly,where would I obtain the software/hardware?
Sorry about the long post. Any help will be greatly appreciated.
Cheers,
Vance
G4 400 mghz processor Mac OS X (10.3.9) 512 ram
G4 400 mghz processor Mac OS X (10.3.9) 512 ram

Both of the G4 Macs you mentioned have built-in Ethernet on the motherboard. They would not require a PCI card to support this function unless the built-in Ethernet hardware on the motherboard were defective (this does not happen often), or you wanted to run much faster than the speed provided by the built-in Ethernet (not generally needed unless you are using a File Server at your location).
You already have a top-notch Apple brand Ethernet interface. Do not let your ISP talk you into installing a different PCI-slot NIC card unless you are certain the motherboard Ethernet is defective.

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Do I need (or do I even have) a NIC card? Modem works, comp not responding

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