Can't connect to internet - but all settings seem correct!

My G5 can't connect to the internet (but my Mac Pro can). I've just had an engineer out because I thought it was the cable connection (I connect via a cable modem). Yet I can ping a host via the Network Utility when I boot from the Tiger DVD - so there doesn't seem to be a hardware problem. But from my user account I can't access the internet.
All the Network settings look fine - no firewall, nothing looks out of place. I'm getting an IP address served by the modem, and Diagnostics even says it can connect to the ISP server just no dialog with the internet!!! It's bizzare. Tried ping from Terminal too, no go. I've repaired permissions, still no go. Only thing I haven't done is zap the PRAM.
This is a direct connection to the modem via ethernet (I usually use a router but it's out of the equation now)
There's something blocking the connection but I can't find out what.
This happened after I swapped the network round so that my new Mac Pro would be the main internet machine (sharing the connection with other machines on my network). Previously I could connect to the G5 via the Mac Pro but that's no longer working, or rather it's REALLLLLY slow, it will eventually connect.
The only thing I've done out of the ordinary is put the drive from the G5 inside the Mac Pro to transfer some of my files. I had used BatChmod to change permissions on some User folders so I could copy them, but I've repaired the premissions since.
please HELP!!!!!!

I solved my problem by installing a fresh system on a different drive and starting from that. My Mac can now connect - but starting up into the other system causes the same no-internet problem so I can only assume it is some OS corruption that caused it.
Hope that helps someone.

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~~~~~~~~~~~~~~~
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Can't connect to internet - but all settings seem correct!

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