Lacie External Hard Drive Not Recognized After It Previously Was

I have a 1 Tb Lacie Big Disk External Hard Drive that I have used for a couple years now.  I have a Mac Pro, an iMac and a G5 computer that I have previously used with it.  After I transferred it between computers yesterday suddenly it will not show up on any of the computers.  I have tried different cables and inputs, computers, other hard drives with the same cables (they worked), restarting the computers, etc.  The hard drives powers on like normal and you can hear it running, the blue light comes on in the front, but it never gets the disk loaded on the computer.  There is a "auto/on/off" button on the back that I have tried switching between but nothing seems to work.  Please let me know if this is a common problem and any way to get it to work as I would prefer not to lose the information on the hard drive, especially when it seems to be functioning just fine aside from not appearing on the computer.

Even backups need backups too.
And a 'good' case is one where you can pulll the drive out and pop it into your Mac pro drive bay.
power supply bricks are known issue.
Mac OS updates that affect those models.
LaCie almost by their own invented the term and idea "reset firewire bus" routine after all.
Years and you can assume not forever but eventually it could and will fail.
I'd pick up a "spare" or replacement unit, one with eSATA/FW800/USB3
http://www.macsales.com/firewire
CallDigit 2 x SATA plus 2 x USB3 $139 - USB3 card and interface works better even on legacy (how long and old is USB2 now?) USB drives.

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