QUOTE(Toddler @ Oct 13 2007, 11:37 PM)

Your normal PC repair shop won't have a clue. You'll need a specialist to have any hope of salvaging it. Assuming you have a firmware backup, you're much better off getting a replacement off of eBay.
Agreed. You probably applied 12V to a 3V component, possibly the controller for the drive. This will fry that lead/component and it'll need to be replaced. If you have the firmware, you're probably better getting a new drive. If you dont, try dumping the firmware - it may still function enough to do so. If not, send it to someone with a programmer to salvage it.
Caster.