2012 Mac Mini and WD MyBook External HDD Problems

I just bought a 2012 Mac Mini (2.5Ghz i5 version) and I can't get my WD external drive to work with it. I just tested the drive with my mid-2010 MacBook Pro, and it works just fine, pops right up and I can view/edit the files on there. When I move it back to the Mini though, the WD drive turns on and the drive starts to move like its turning on, but nothing shows up on the Mini, either on the desktop, Finder or through the Disk Utility.
Any suggestions? To my knowledge the WD drive I have is USB 2.0/3.0 compatible, and I know that the Mini has all USB 3.0 ports so I'm confused as to why it isn't working.
Thanks in advance.

If you have Disk Utility open when you attach it to the Mini, does it show for an instant in DU?
Is it a Bus powered drive or does it have an A/C PSU?

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