Up until recently, we have had one pc and three macs all shairng files nicely. We constanly send video over to the pc to be processed for the web. We swapped the pc over and i tested it all and everything seemed fine. However i now find only 2 out of the 3 macs can find the pc. I checked sharing settings are the same on both macs, reset the pram, repaired permissions, checked the firewall insint on and even talked nicely to it. But nothing, it can find the other two pcs on the network but not the pc. Any ideas?