G4 not connecting to the internet

2002 PowerMac G4 Quicksilver (originally 933 mhz, now +/- 1.5 ghz)  I have been using a wireless connection to my internet.  I do not have the Airport hardware but I think I had an Airport icon on the top bar of my screen up with the speaker and the American Flag.
I'm posting this from work on a PC so I don't have my Mac info handy.,
I called my internet provider and they found the problem to be with my Mac.  He said I should have an Airport Icon on top odf my screen if everything was working correctly.  He also noted that if I was on a PC he would think I had a virus.
I can't connect to the internet and when I go to send e-mail it says it can't reach my outgoing mail server.
When I go to system preferences and click on network a window pops up that says my network settings were reset by an application.
this is the best I can remember. 
Can anyone recommend a course of action o correct my problem and get me back online?
thank you!

Hi, obbay -
It sounds like the connection is sporadic - sometimes there, sometimes not.
First thing to try is to shut the Mac down, then unplug the ethernet cable, both ends. Check inside both ports for dust or dirt, and the cable ends for damage. Then plug the cable back in. Boot up and test.
If that doesn't fix it, consider replacing the cable. If you have a spare one handy (it's not a bad idea to keep one around; you never know when one might be needed) that makes it easy. Shut down, swap the cable, boot back up and test.
I've had instances where one of my cats has fanged a cable, causing a short. The nasty part was that the fang mark was near invisible - had to examine the cable closely inch by inch to find it. The only way I found it was the cable that was at fault was to try a replacement.
If neither of those fixes it, consider that a port may have gone bad. Since your router probably has more than one port, try using a different port on it. If that fixes it, good.
If not, consider whether the one on the Mac has gone bad. Not sure what can be done if that is the case - the Mac has only one ethernet port, and it is hard-connected to the logicboard. Not sure if there are ethernet PCI cards.

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