Is this an Intel iMac or a Power PC? If the former, the drive should be "GUID", not "Apple Partition Map".
Also -- is this a "Porsche Design" drive? LaCie has indicated in the past that these drives don't always work properly during boot when Journaling is on. Why that would be, I don't know.
You can also see if this works:
- Disconnect all external drives.
- Get to the "Option+Boot" chooser
- Wait for it to become "idle"
- Connect the external drive
- Wait for it to spin up
- Click the "refresh" arrow
- If it appears, immediately select and click "boot arrow"
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--Dave Nanian
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