It sounds like the fall has damaged the connection port on the case. If you have the ability, I suggest that you remove the drive from the case, install it inside your QS as a slave unit and see if it will mount on the desktop. If it will mount, then you have a damaged case connection and need to find a replacement case. You can salvage the drive this way and you only have the expense of a new case. If it won't mount at all, then the drive probably took a fatal hit from the fall and the cost of recovering any data from it will be astronomical. Companies like "Drive Savers" charge more than most individuals are able to pay for the recovery process. You can also test the case connection hardware by installing a known "good" drive in the case and trying to start it up. If the "good" drive mounts, then the case is good and the 'fallen" drive is bad. By testing the separate components, you can limit your replacement cost to only that item. Hard drives are getting cheaper all the time and you might consider getting a larger replacement. If both parts refuse to cooperate with you, throw them in the trash can and bite the bullet for a complete replacement.