LaCie no longer recognize, system profiler says "Unknown Device". Help?

I've used an external LaCie drive for about a year to handle Time Machine. Yesterday morning when I started up my iMac wouldn't mount the LaCie. I tried both firewire plugs, restarting, resetting the firewire bus - my iMac can no longer see the LaCie drive. However, if I take my external to another iMac, the drive shows up and works just fine. If I take a working external from another iMac, it cannot be recognized by my iMac. Any help would be appreciated!

I had a similar problem with my LaCie drive.
It turned out that the problem was an intermittent fault with the power supply. I had contacted LaCie technical support here in the UK and was advised how to test the power supply:
"leave it plugged into the mains socket, power switched on and hold the power supply (black oblong box) to your ear, it should be silent, if the power supply is making a noise, mine made a quishing sound, chances are the power supply is duff"
Once confirmed back to LaCie technical they asked me to return the faulty power supply and 2 weeks later a new working replacement was delivered. My drive now works perfectly.
I'm not sure if this will go some way to solving your problem but it's worth checking this out.

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