Are you using a PCMCIA adapter for wifi? If so, I believe one of the jumpers on the mediator disables the PCMCIA port. I have a 100mbps pci nic, so wasn't an issue there, but before I found one that worked (mediator is kinda picky about ethernet cards sometimes) I used a 3com pcmcia ethernet card without much trouble (chassis issues, mostly, even with the right-angle adapter, the cable got kinda pinched). I'll have to look through my mediator manual, and see if I can't dig up the jumper settings.
edit: OK, only mention of the mediator jumpers about the PCMCIA port is about the 4MB window (as opposed to 0 or

, and it mentions this if you use a 4MB PCMCIA expansion. This isn't surprising, considering how C= had the port mapped. It doesn't mention disabling the PCMCIA port for 0 or 8 MB windows, but I vaguely recall reading about that somewhere. (Pages 2 and 3 in the manual, at least the English section)