Connected to the internet via ethernet, BUT...

I turned off my computer, modem, everything and uplugged it all because of a severe lightning storm Saturday. Since I turned it back on the next day I haven't been able to access the web or my mail. However, the problem must be with my G4, because I have an iBook on Airport and I'm able to connect to the web and email with it. So the cable modem and Airport are evidently working properly. My G4 network settings all appear normal. I've got a green light saying I am connected to the internet via ethernet, but I'm really not. My email won't go online and no browser works, although I don't get a "can't connect" message on the browser screen, it just stays white. I had this problem before but I can't remember what I did to correct it. I just remember unplugging the modem and Airport over and over, in different order, and resetting preferences. But I don't remember what I did, if anything, to actually make it work again. Does anyone have an idea on what I can try to REALLY connect?
Thanks in advance for your help.
Frustrated in Florida,
EG

Tough to troubleshoot lightning in person, moreso at a distance!
Things to try...
Type 17.112.152.32 into your browser... thinking it may be off looking for a DNS server that doesn't exist.
Launch Network Utility and see if you can Ping like that addy, or your other computer.
Results may help us get further.

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