Imac won't mount lacie drive

I had a new internal hard drive installed on my iMac. The data from the old drive was backed up to a Lacie P'9231 external hard drive (brand new). Now, the iMac won't recognize the Lacie drive, so I can't reinstall my data and settings.
When I start up the iMac, it goes through the whole multi-lingual welcome and then asks whether you want to set up a new computer, restore the computer from another part of the internal drive, or use Time Machine to restore it. I checked Time Machine because I thought that the iMac would see the Lacie as a Time Machine device. It doesn't. As far as I can see, the obvious stuff--connections, power, etcs, are OK.
I'm wondering if I shouldn't just let the internal hard drive set itself up and THEN import the backup from the Lacie drive, rather than attempt to import through Time Machine.
Any ideas?

One of those options should be to restore from another disk/volume/partition. Use that.

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Hi,
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Shut down the computer.
Unplug the computer's power cord and all peripherals.
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Attach the computers power cable.
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Shut down the computer.
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Press and hold the power button for 5 seconds.
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Attach the computers power cable.
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Imac won't mount lacie drive

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