Hello,
If MAX do not recognize the GPIB, it means it is not installed correctly.
Did you install the drivers after having installed LabView, it is the good way to operate.
What drivers did you install, you can dowload "NI-488.2" at this address:
http://digital.ni.com/softlib.nsf/websearch/1DDE5C48F30C2C658625702000681295?opendocument&node=132060_US
It is the apropriate driver for your application.
You can also go to this address to have more information about the installation and configuration of your device.
http://www.ni.com/support/gpib/enet95/default.htm
Hope I could help you.
Johan G. NIF