Permanent loss of Internet connection on new iMac - old G3 works fine

After 1 month new iMac won't connect to Internet. (Cable modem/ethernet) All usual procedures tried - powering off modem/unplugging connection etc/rebooting. Network connections show valid addresses etc and modem shows correct lights - even sending/receiving!
Reconnecting old G3 works immediately! So can't be problem with ISP or cable modem.
Any ideas please?

Update for anyone reading the first post.
Solved the problem by archive & install 10.5 and updated again to 10.5.1 and other updates EXCEPT Security Update 2007-009 1.1 which I installed yesterday and coincided with accessing the net problem!
Question - now to install this Security Update?!

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