PLEASE HELP ! What is the problem with my external hardrive?

Hi everybody . This morning i accidentally pushed my 500GB harddrive and it felt without hitting the floor and it stopped working now when i plug it in,the light shows ,there is a buzzing sound that i percieve and then stops ,when the sound stops,my laptop recognises it but nothing more happens . I need your help please .Tell me if there is still a way to fix this .

Try opening the disk management tool if you have Windows or the disk utility app if you have a Mac, and see if the hard drive is recognized there.  

Disk Management

http://wdc.custhelp.com/app/answers/detail/a_id/1284

Disk Utility

http://wdc.custhelp.com/app/answers/detail/a_id/866

Ususally when a drive gets dropped it’s physically damaged and beyond do it yourself fixes. Professional data recovery may be able to get some of the data back.

Joe