hi grubby , is doki your other half then?.
he said the PS3s his but you say its yours so thats a sticking point
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did you try temp turning off ALL security and firewall options on the router , then see if the ps3 would then connect...?, that at least would rule out some abscure security compatability in the current firmware of your/his PS3...
but then that still doesnt really explain or hint at why a direct wired to the router didnt work to me.
i assume you can plug in a second generic windows PC and it will be given a valid and working IP by the DHCP server on the router?.
what version ps3 firmware btw, the latest i assume.