Hi, the advice already provided is as accurate as it gets. If you're lucky the power board took the damage and the drive is okay and will work in another enclosure or inside a computer. If you're unlucky the whole deal is fried and your data is likely lost.
You can call our support to get some advice on how to recover the data and test the mechanism itself. We can be reached at 503.844.4500 (USA) or www.lacie.com/mystuff
~mn, LaCie