IMac G5 can no longer see Macbook on my network

I have a home network on a wireless linksys router. I use an iMac G5 and MacBook. Both computers were working fine and could see one another. Now the iMac no longer sees the MacBook. It CAN see my Dell Laptop when it is on the network and connects fine. My MacBook sees the iMac no problem.
Both computers have file sharing and web sharing on.
I have tried logging on and off my accout to see if the finder on the iMac can see the macbook. Nothing changes.
I have tried connecting the computers directly with an ethernet cable, nothing.
Please help. I'm new to this

Should work the same for Ethernet, Wireless, FW, what have you.
That question has been asked more than a few times, I think answered too, but I can't remember for sure... messed up aliases, Passwords, Permissions, Files???
My connection, or Apple's Forums are excruciatingly slow for me at moment or I'd try searching this Forum for the cure(s).
Thanks

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IMac G5 can no longer see Macbook on my network

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