External HD is not being recognised by my Macbook anymore.

Hi,
My External HD is not being recognised by my laptop anymore.
It was working fine with the laptop as my time machine etc but the other day on the desktop I changed its' name to 'Nells External HD' or something like that.
When I have subsequently replugged it in it is not showing up on the desktop at all.
The time machine is not backing up and when I click into the time machine and browse for other backup disks it cannot find anything for me to select.
Any help/ advice on how to find it would be appreciated
Thanks

I have a similar problem using Mavericks and Time Machine.
The external HDD is no longer displayed on my desktop, I have changed USB ports and each time Disk Utility see the HDD and reports no problems with it, yet no icon is diplayed on the desktop.
Time Machine does not see the external either. This is the first time that I have tried to backup since my last, successful attempt, 7 days ago.
Any suggestions?
John

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