External Lacie D2 Quadro Drive will no longer mount on iMac.

Hi all,
I'm running an Intel iMac on Snow Leopard, maybe 18 months old.
I've had my Lacie drive (D2 Quadro) for maybe 3 years or so and it has never once caused me any problems.
Lastnight, I accidentally didn't eject the Lacie drive properly before connecting it to my Powerbook.
Since then, the Lacie drive shows up fine on my Powerbook and all files and folders are present, but when I plug it back into my iMac it doesn't mount anymore - the iMac won't recognise it.
I've tried the following to fix the problem:
- tried and tested both Fire-wire ports (both fine)
- tried to disk repair via Disk Utility but the drive is greyed out so won't allow me to verify or repair.
- Ran Disk Utility via Snow Leopard disc on startup, but it's also greyed out.
- Ran Disk Utility by connecting Lacie to Powerbook instead. It verifies and repairs it, saying everything is fine - still won't show on iMac.
- Left the drive unplugged (power and fire-wires) overnight. Plugged in this morning and it's still the same.
Any help is appreciated.
Cheers,

OK, Let's wait until you get the chance to do the SMC reset then we can try some other steps. The following instructions will be in the SMC reset instructions I sent earlier but I wanted to point them out because the instructions does cover multiple Mac models and some have different processes.
1. Shut down the computer. Make sure you quit all applications prior to shutting down.
2. Unplug the computer's power cord.
3. Press and hold the power button for 5 seconds.
4. Release the power button.
5. Attach the computers power cable.
6. Press the power button to turn on the computer.

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