Both my Macbooks can no longer see my iMac on the network

No clue what changed or what happened. I had it set up fine and up until the last day or so, my Imac was showing up in the Finder shared section on both of my Macbooks and I was doing backups via Airport from the Macbooks to the external drive connected to my iMac. Now the whole thing is down. No shared section on either of the Macbooks and the Time Machine backups fail because it can't find my external drive.
In my file sharing preferences on the iMac, I have my LaCie external drive and my public folder listed as shared folders, and I have my account, the user accounts from both Macbooks, Users, Administrators and Everyone selected under users with read and write access.
I have no idea what went wrong and would sure appreciate any advice on this. Thanks Much.

This is just a hint. Have you recently rename your Computer Name? I have had a problem to see PC computers on my local intranet. I got no problem to connect to all PCs thru IP address but they were not visible on my mac mini or iBook under Shared. When I renamed my Computer Name back to one which I've had before everything come back to normal. (I've had renamed name of my mac mini which I used to configure my AirPort Extreme and AirPort Express base stations. My guess, network configuration in Leopard is very sensitive to computer which you using in the first place to configure your local network) This is just a guess,see if it will help you. Good luck!

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