my 160gb western digital external drive dropped recently and i have been unable to access it since. it starts up, my win7 pc makes a little sound acknowledging that something has been plugged but nothing shows. there;s no sign of it anywhere.
Another thing you could TRY would be to remove the HDD unit from inside the external case and connect it instead as an internal HDD inside your desktop system. IF you are really lucky, the HDD itself might be OK and you could access its files that way.