IMac does not recognize MacBook Pro over wireless network

Hi,
I have an iMac running MAC OS X version 10.5.7. It is connected to the Internet via an Airport Extreme Base Station. I just bought a 13-in MacBook Pro that runs the same version of MAC OS X. I connect it to the same wireless network. The MacBook Pro recognizes the iMac (there is an icon of the iMac in the Shared Section of the Finder window). The iMac, however, does not recognize the MacBook Pro. If you have come across this problem and have a solution, I would be most grateful for your advice.
Regards,
MTL

I'm having a similar problem with an Intel iMac and a G4 iBook (both running Leopard 10.5.7) since the recent replacement of the iMac's hard drive. Occasionally the iMac will 'see' and allow me to connect to the laptop, but often the connection just drops out, and then I can't find the iBook any more. The iBook, on the other hand, can't detect the iMac at all. I know I have all the settings right - before the HD replacement, everything worked fine in both directions. Interestingly, in the 'WINS' settings in network preferences, the iMac's 'name' bears no relation (just a list of numbers and letters) to the computer's actual name, while the iBook uses the first word of its own name. It's frustrating, as I have to synchronise my work between the two on a daily basis. I can't get them to connect via ethernet cable either.

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