IMac no longer seeing Lacie external HD

Hello =) I'm hoping that some smart cookie here can help me.
My iMac no longer sees the Lacie firewire external HD that I've had connected to my computer for the last year or so. I don't know exactly when it stopped seeing the drive, but it's a problem now that I want to use it
My computer is only on while I use it - I shut it down every night and it's off while I'm at work. The Lacie hard drive is on all the time.
I've run the Apple hardware test from the CD that came with the computer, and in the system profiler, nothing actually comes up apart from "firewire bus".
I don't really know what else to try. I've plugged the drive in to my housemate's Mac Mini and it works just fine, so I've narrowed it down to my computer.
Any thoughts?
Many thanks =)

Hi Tanythe-
Greetings and welcome to the Apple boards
Take a look at this: What to do if your computer won't recognize a FireWire or USB device
I think the solution may be the reset of the bus as indicated in the 5 steps, but it is worth following the first part as well.
Luck-
-DaddyPaycheck

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