I am wondering if anyone can help me with this network problem which has tortured me since I bought an iMac earlier this year, and only got worse this week when I set up a new (refurb) Mac mini. I cannot get all 5 of my computers to see each other on my home network. I have posted specific computer-by-computer detail below, but the basic problem seems to be that my computers cannot see the new Mac Mini or my old Macbook. I am still a bit of a Mac newbie, so I am wondering if I am overlooking something obvious. I have tried manually connecting the macs together by entering the ip address but that does not seem to work. If anyone has any ideas, they would be much appreciated. All of the Macs run Snow Leopard now, though the problem started when the iMac and Macbook still had Leopard. Specific info: 5 computers 2006 Macbook early 2009 iMac early 2009 Mac Mini 2006 PC laptop (running XP) 2009 Dell mini netbook (running XP) Dell mini can see the iMac and PC laptop Macbook and Mac Mini can see the iMac, PC laptop and Dell mini iMac can see the PC laptop and Dell mini PC laptop can see the iMac and Dell mini Dell mini can see the PC laptop and iMac *Also, the new Mac Mini replaced a HP desktop (running Vista), which could see the iMac, PC laptop and Dell Mini--the iMac was unable to see the HP, but the two Windows based machines could.