Can not connect to computers on network

We have 3 macs connected through a D-Link with Ethernet cables.
On one of them (G4 with Tiger) I changed a hard drive temporarily
and I reinstalled the original drive (I also changed passwords but put back the original passwords on all computers).
Since then, I cannot connected to that computer as a registered used, the old and the new passwords do not work anymore (yes, I checked if caps lock was on...).
The 2 other computers are a G5 on Tiger and another G5 on Leopard. On both the G5s I can only connect as a guest on the G4. And from the G4 I cannot connect the the 2 other ones.
The 2 G5 can connect to each other with no problem.
What can I do?

Try coonecting to one of the G5's with the G5's Username & G5's Password.
Have you tried Finder> Go menu>Connect to Servers and typed in afp://ip of.the.g5, like...
afp://10.0.1.4

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