External HDD shows up on Macbook Pro but not on new iMac

I recently purchased a new 21.5" iMac and when setting it up, I utilized the Time Capsule backup from my Macbook Pro; everything seemingly went fine and my iMac was set up with all the data on the Time Capsule at the time (last update was a few months ago). Once everything was ready, I signed into the Mac App Store and downloaded the Yosemite upgrade (the iMac came with Mavericks). All the while, the Western Digital External HDD was not connected to the iMac.
Once everything was complete, the system rebooted and I was off and running with my new Mac.
The problem comes in when I tried to plug in the WD; everything lights up and it seems like the system is picking up the drive but then it just hangs there. It does not show up on the Desktop or the side panel in the Finder but it does show up in Disk Utility. When I verify the disk, it tells me that it is not mounted and when I try to mount it, it tells me that I cannot and to try to run First Aid on it. I have run a Repair disk and that made no difference.
The real head-scratcher is that the Macbook still picks it up without any issue but the new computer does not.
Can someone please help?
P.S.
The WD was never formatted for Mac since it worked on the Macbook right out of the box and now I have about 500+ GB worth of info on there that I would rather not lose.
Thank you.

It's something I can look into doing although I don't have a spare drive to copy all of that to and/or am not really looking into getting another HDD.
I am mostly wondering if anyone can provide an answer, or rather a reason, as to why it will legitimately work on one Mac (without any issue) and not on the other...especially if the new system has been set up using the information from the first one.

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