External hard drive not recognized

 Hello guyz,  Pls  I have a challenge with my external hard drive, it connects and installed well to the computer but  it is neither   listed in my computer explorer nor  shows its content. I have got some solutions from the internet  but aren’t working for me . Like under disk management I have tried to change the the drive letter and path but the link isn’t active. pls any help?

Try the following suggestions:

WD external drive is not assigned a drive letter by Windows or Mac OSX and data on the drive is inaccessible

http://wdc.custhelp.com/app/answers/detail/a_id/1164

MyBook Live 3T external HD stopped being recognized. Spins, light is blue. Ethernet cable changed…no difference.

Thought it might be Windows 10 since the WD shows this drive not Win 10 supported, so I reinstalled Win 8.1. Still nothing. Tried different computers with a direct ethernet connection… nothing.

All the reading I’ve done indicates the drive is dead and could be the board. The HD is ~3 yrs old.