One mac being difficult on LAN

Hi, wondering if anyone can help.
we have a small LAN in our office, theres a switch, patch panel and router in the cupboard which connects 3 macs and 2 pcs with a RAID shared drive and a laser printer.
two of the macs are a mac pro and powermac which are ok at the moment, the other is a imac running osx 10.4.11 and for some reason, although it can connect to the internet and the printer etc, it cannot seem to connect to other computers or the shared RAID using the network shortcut or the "go" > "connect to server" method either...
the other macs you simply navigate in the browser to network and all the items show up for you to connect to them.
i have even tried go connect to server and typed the exact ip in but that doesnt seem to find the RAID drive either, im sure i used to be able to do it on that same computer so i dont know why i cant now.
any ideas?

Hi, are the first 3 IP numbers of the 10.4.11 Mac the same as the first three numbers of the IPs of the others, with only the 4th number different?

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