Computers do not recognize my WD My Book Essential

You know my 500GB drive just recently started doing something similar.  I connect it, and the blue activity light comes on on the front and it even shows up in Device Manager under Disk drives as WD.  It shows as a disk in Disk Management that needs initialized, but when I try to initialize it I get an incorrect function error.   Still trying different things but nothing has worked yet.  If something works I’ll shout.  If anybody else is familiar with this I would love to hear what you did to fix it.