Any fix for external Iomega HDD won't mount to iMac OSX 10.8.5 Desktop?

I have a 750GB Iomega external HDD that I've used for several years to back up my iMac (OSX 10.8.5) with Time Machine.  No problems.  Computer locked up while searching on the internet last night, requiring a restart.  The external HDD never came back up on my desktop,  It has power and all cable connectors are tight.  The disk powers up and runs, but it just repeats its attempt to mount over and over, but won't show up on the desktop.  So I can't run Disk Utility or any diagnostic software, since it isn't accessible form the iMac.
Any suggestions?  I'm guessing my only option is to bite the bullet and buy a replacement backup hard drive, and start over from scratch in Time Machine.  My attempts to look for help on the Iomega site have been frustrated by the new post merger Lenovo-EMC based site.  Practically no references found to Iomega at all!

Yes, I checked that, and I tried restarting the computer with the HD turned on, then again with the HD turned off until after the computer finished booting up before turning the HD on.  Nothing has worked to get the externa; drive to show up on the desktop.  Thanks for replying.  I'm not holding out much hope that the drive is going to work again.  I'm on my way out to pick up a new backup drive.  I figure I'll get one that is at least a TB, and 3.0 USB capable so that when the time comes that I replace my old iMac, the new drive will at least be able to back up the new equipment. 

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