My Passport Ultra 2TB not showing up on Mac OS X Yosemite

WD External Drives External Drives for Mac
1

I have trawled You Tube & found no solution. I bought a new lead & tried it on another laptop. It is powering up & the light is showing, but it isn’t showing up in Finder or on my desktop. External hard drives is ticked, i’ve checked. Thanks for any help in advance.

2

It is showing up under system information - hardware - USB

But I can’t open it

3

It isn’t showing up in disk utility