It could be a seized/bent spindle, not uncommon for Maxtor/Seagates with impact. First thing to do is get the disk out of the enclosure and mount it into a desktop as an internal drive to verify if the enclosure may have been damaged. Unfortunately, the chances of an affordable recovery on those drives is pretty slim if it is a spindle issue. Probably in the $1200 - $1500 range. It would require a platter swap into a compatible drive - and those drives have baffle plates between the platters which makes it a highly specialized operation.