Lacie External Hard Drive disappeared!

Updated my G5 and iBook last night to 10.4.9. This morning noticed my Lacie HD, connected via firewire to my G5, wasn't showing on the desktop. At first I thought it might be connected to the update, so I plugged it into my old G3, running 10.4.8, but there was no sign of it there either. I have searched for it using Disk Utility, System Profiler and Tech Tool Deluxe, to no avail. The HD itself looks and sounds as though its working normally, light on, sound of spinning etc. I unplugged everything on the G5, ran repair permissions, restarted, turned off and left for 20 min, restarted and plugged the Lacie back in. Nothing. I swapped cables, no cigar, and then tested my Firewire scanner on the same ports, it showed up immediately. Lastly I plugged the Lacie into a friend's G4, who also uses Lacie HD's, again, it failed to show.
Does this mean it's definitely the Lacie that's the problem, or is there anything else I need to tinker with on the computer?
Thanks very much!
iMac G5 iSight 2.1GHz, iBook G4 1.42GHz, iMac G3 Snow 700MHz, 2x iSight   Mac OS X (10.4.8)  

Andrew: thanks for the reply. Just two firewire ports on the rear of the Lacie, so can't try usb. Tried Lacie update, but, like the other applications I mentioned, it can't see the HD, so it says there is nothing to update.
Unplugged Lacie from computer, turned power on, spinning up starts. Pressed blue button to stop it, then reconnected firewire cable to computer, spinning up then starts again. Does this mean that, to some extent at least, the computer knows it's there? HD bought approx 2003 btw.
When I updated to 10.4.9 I repaired permissions before and after, and subsequently, but Lacie still invisible..
Christopher K: Yes it was attached, and on... oops! Don't understand why mine wont work on a pre-update computer though?
iMac G5 iSight 2.1GHz, iBook G4 1.42GHz, iMac G3 Snow 700MHz, 2x iSight Mac OS X (10.4.9)

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