Duff24 said:
Thanks for the ideas - here's a brief progress report.

On Win XP - where the printer works fine from 3 desktops, 1 laptop and 1 netbook
Pinged its i.p. address but got no response
Used telnet to i.p. address and got no response
Used the HP network diagnostic under XP and it reports no printer but sees all other computers on the network - again the printer works fine.

On Win 7 64 bit - printer doesn't work and same results - no response from ping or telnet. HP diagnostic can't identify the printer.

I'll keep looking around the net for ideas and report back here if I get anything.

Thanks to all.
This is because the printer is using ipx and not ip, so you cant ping the IP address