Network problem - two Macs running Leopard won't connect or share

We've just bought a refurbed Mac book Pro since our HP notebook is so bloody unreliable and I suspect is about to cark it through overheating/inadequate cooling. The only problem is that networking it with our G5 is turning into a real nightmare, and embarrassingly both the HP and an old desktop PC can not only see and share with each other they can also see and be seen by both Macs and use the printer connected to the G5, and absolutely everything connects to the internet and shows up in the DHCP list on the router. Even more annoying was that the Macs connected initially this morning when we got the Macbook Pro out of the box, but after we'd done the initial round of software updates (10.5.2 was installed on the MBP) we've had nothing but trouble. Quite often they'd be in the shared list in the Finder window but wouldn't connect when clicked. Other times they wouldn't be there at all. We've even tried connecting the two over firewire, which worked for the G5 but not the MBP although the MBP could see the folders on the external hard drive we use for Time Machine backups of the G5.
File sharing is on for both Macs (and printer sharing for the G5 obviously), AFP is enabled, firewall settings have been moved to Allow All... everything looks right but it doesn't work right. Right now I've managed to get the G5 to connect to the MBP using the Go>Connect to Server method mentioned elsewhere here, but it's one way only. It didn't work when we tried it on the MBP.
The network is part cabled, part wifi. We've got a Motorola Surfboard cable modem/gateway/wireless router, both notebooks are connecting wirelessly, both desktops are cabled. If it makes any difference both Macs are on 10.5.5, the old desktop is Win2K (please don't laugh) and the HP notebook is Vista.
Any suggestions?

Well, it all seems to work now though I can't explain why and have no idea if it would work for others generally. But what we did, having reinstalled 10.5.2 and got the MacBook Pro back to exactly how it was when it arrived, was to install one update at a time checking that the two Mac could still communicate after each stage and with regular backups to be extra safe. The order we did the updates in was:
Airport Utility
Remote Desktop Client
iTunes
Front Row
Mac OS X Combined
Migration and DVD/CD Sharing
Java
Airport Extreme
QuickTime
QuickTime H.264 Compatibility
Security Update
Safari
Maybe the order doesn't make a difference, I really wouldn't know. But then it doesn't make sense to me that updating one item at a time would make a difference either. However, we now have the network working properly with the same network settings used before when it was hit and miss at best. Glynn, maybe it's worth giving it a try on yours though without a clue why it's now working here I couldn't call it a solution as such.

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I have a curious networking problem and I would love some suggestions about what might be causing the problem and how to cure it.
I have a PowerMac G5/1.8DP running Mac OS X 10.5.8 Leopard with a number of external drives attached that I use as backup for all my RAW files. These are mirrored on three drives.
When I mount the drives on my iMac desktop, running OS X 10.10.1 Yosemite, over a gigabit ethernet network, two things are happening - 1. some of the folders are invisible (although they are actually there and populated on the PowerMac) and 2. spurious, empty, folders with odd names appear on the Yosemite desktop.
I have checked on the PowerMac to see that the folders all contain files - they do - yet over the LAN they appear as empty folders with gobbledygook names. This happens on all my Macs running Yosemite so it appears to be a Yosemite problem, rather than a Leopard problem. To further reinforce that I have also checked the PowerMac from three other Macs, running Tiger and Leopard, and they can see exactly what is on the drives, with no missing folders or oddly named folders.
The images show 1. the folder as it appears on the PowerMac running OS X 10.5.8, with two folders RAW Files 26 and RAW Files 28 highlighted, 2. the same folder seen on the Yosemite desktop with two folders, RAW Files 26 and 28, missing and 3. the same folder on Yosemite with three oddly named empty folders.
I am at a loss to know how to cure it and hope that someone will be able to help.

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I have problem with sharing file from my Mac running Leopard to my Windows machine (running XP and Vista). I follow the instruction on this website. http://lifehacker.com/software/mac-os-x-leopard/leopard-simplifies-networking-31 7033.php
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I just installed Airport Extreme. It works as a wireless network on my Macbook. It won't connect with my Windows Visa PC. Message reads: "settings saved on this computer for the network don't match requirements of the network." I seem to need to enter a security key/passphrase to connect to the PC. Where do I find them?
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The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information.
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I read that we can activate (see?) spaces with F8. I have a MAC BOOK so I think FN and F8. But when i press nothing happens. i am not sure I understand this. I never used shortcuts before so maybe I am missing something.
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My apologies in advance if I am stating the obvious here ....
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Network problem - two Macs running Leopard won't connect or share

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