Fix for temperamental ethernet connection?

Wireless is working fine but I've developed a problem with my ethernet connection. It connects some of the time but very rarely when I launch Safari. It will work for a few minutes and then stop. I get a series of red lights in network diagnostics. I think the problem preceded the infamous security update which affected my machine but which I was able to resolve.
I have repaired permissions, deleted the plist files in system configuration, created a new location and manually entered the settings. But to no avail.
My G4 is six years old and I suspect that I should not have upgraded to Tiger because there seem to be some compatibility issues (for example, I can no longer reliably use an external monitor because my machine is often forced into sleep mode when the monitor is connected).
Does anyone have any ideas?

Hi JBKL, and a warm welcome to the forums!
For the Ethernet Location... Is that Interface dragged to the top of Network>Show:>Network Port Configurations?
It may be that the Router needs a Firmware update to keep up with the OS Updates... check online, don't trust any automatic checking feature in the Router.
Where are we now?

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