I stumped HP and QMS with this, so I'll ask real experts . . .
We have network with the following configuration: PII-233, file-and-print server with NT 4.0/SP4, 10/100 hub, DHCP, WINS, and mainly Windows 98 clients. In December of last year, we installed a QMS Magicolor2 color laser, to go along with our (monochrome) HP 4000N. Both are networked and attached to the server, each with its own port.
About two weeks into January, the QMS decides to stop working. Can't for the life of me figure out why -- with troubleshooting help from QMS, I determined that the problem is that the HP is stealing the QMS's IP address! The HP is at 192.168.0.8, while the QMS was at 192.168.0.15. (I've since uninstalled it.) But when I unplug the QMS from the network and ping 192.168.0.15, I still get a response. I print out the HP's configuration, and it tells me it's at 192.168.0.8. Better yet, run Network Monitor while pinging, and you can see the 192.168.0.8 replies for 192.168.0.15 in the Echo/Echo Reply. Very weird.
So, we're stuck with a printer that can't get connected. Any ideas? I've put a bunch of points here, so start those cards and letters coming. Thanks in advance.