WD 500GB HDD problem!

My Western Digital HD 500GB hard drive constantly clicks approximately 3-4 times and then stops completely. This occurred when I was copying files onto the hard drive and the hard drive (internal) fell on the ground. After that occurrence I have been unable to access my hard drive. Can someone suggest a fix to this dilehma?

Maybe data recovery.  There may not be much you can do if you dropped your drive on the floor.