what kind of enclosure is it?
What was the old drive?
You could test if it's a power draw issue by powering it from your desktop power supply while it's still in the enclosure. I agree it's doubtful, but it might need mucho startup current.
I've run into something similar where external USB/FireWire controllers didn't like the capacity or some other characteristic of the IDE drive and would keep resetting it, including power up/down. Annoying. The two I own have hard-coded capacity limits that weren't disclosed until I asked their tech support people. One of them does this endless power up/down loop. Argh. You might want to send the mfg. a quick email about this.
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