Cannot mount 'My Book' HD no matter how I try - any advice how I can do this?

Can you offer any advice or help with the following:
I have a WD external Hard drive connected to my iMac
I cannot get the HD to mount although the Smartware disc shows on the desktop
I've tried disc verification and repair and the result is that the HD is fine - no errors or problems indicated - the HD shows in Disc Utility but not in finder sidebar.
I've tried everything to get the HD to mount, all to no avail.
It will mount on my MacBook so i don't think the problem is with the HD
When I go to Finder - Go - Folders - and type /volumes all the HD folders are showing but with a little delete icon in the bottom right hand corner (little red circle with line through).
When I go to Time Machine it is not showing me the 'My Book' Drive for backup - it says no ndrives available.
This has only happened in the last three days. Before that the HD has been working perfectly for the last two years as my backup drive.
Any thoughts or advice would be appreciated.

I click the icon in the taskbar. The editor works fine but the organiser has stopped working. I have 4 catalogues and approx 19000 pictures in them but organiser has stopped working.Have reinstalled the software but this didnit resolve the problem

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