Bear in mind that some cards will refuse to initialise without an ethernet conection present. Therefore if the connectors got a little glitchy for any reason (oxidisation, strain against the plugs) then it might not "see" the link. If you're doing something like turning the amiga on, then turning the modem on... that could confuse things. Turn the modem on first, then turn the amiga on. Also double check your modem hasn't got an uplink/lan switch for the ethernet port that you've knocked. One setting will be a "crossover" for connecting direct to a router or hub, the other is straight through for connecting direct to a PC or in this case the Amiga.
RW222