Target disk mode is not detected

I have a Mini running the latest Snow Leopard (and also a MB Pro - same OS rev.).  The same (non)result is happening on both.
I am trying to connect, via Firewire, to an old PB G3 (running 10.3) - after plugging in the Firewire cable I start the PB-G3 in target disk mode.  Its screen shows the firewire logo.
However, system preferences on the Mini (or MBP) does not show the Firewire connected to anything.
The Mini and the MBPro use different Firewire cables (the MBP uses the old 400-400 cable style & the Mini needs the 800-400 style cable).  So I don't think it's the cable.  Also, the Mini can use that cable to successfully mount a Firewire hard drive.  That drive mounts and System Preferences on the Mini shows that it is happy with that drive under Firewire.
The PB-G3 is operational - i.e., I can boot it up successfully.  I just want to mount it as a target drive to copy off some files.
Any ideas how I can get the PB-G3 to mount in Target Disk Mode via Firewire?

baltwo wrote:
If the G3 shows the FW icon on the screen,
It does.
all you have to do is connect it to one of the others with the appropriate FW cable, and it should pop up on the screen as a FWHD.
and that is precisely what I reported is NOT happening.  It does not mount -- not on the Mini and not on the MBP.
Disk Utility does not "see" it.  Neither does Disk Warrior.  And System Preferences/Firewire does not show anything connected.
The FW cable is good because when I use it to connect to a HD, that shows as expected.
Indeed, I have read the KB article.  Yes, I have never had this happen.  That's why I'm reporting/asking about it.

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