I think you probably have blown the electronics on the HD controller circuit board. You might get lucky and find that you have only blown a fuse (or two) on the board. If you look really carefully near the where the 12volts and 5volts comes into the board, you might see two very small fuses in series with the circuit traces coming from the power connector. Measure them with an ohmmeter. If one or both are open then buy new ones of equal current rating or take some from another dead Hard drive and solder them on. If the fuses are good of if it still doesn't worjk after you've replaced the fuses, then another option would be to get an identicial drive and swap controler cards between them. IMO, sending the drive off to a place that recovers data will be cost prohibative..