I can't connect my external hardrive to my MacBook Pro...

I have a 2012 MacBook Pro - when I connect my Porsche external harddrive to it, it lights up but it doesn't show up on my Pro.
If I connect this hardrive to another Mac it's fine. It used to work perfectly, which makes me think it's not a power issue. I have tried changing leads and changing ports to see if this rectifies the issue.

From the Finder: Finder>Preferences>General. Check the box -External disks.

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    Hi!
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    Thank you for your prompt response.  I'll be honest I'm a retiree and a newbie to all of this stuff. I don't even know how to do a thread. (Embarassing) This is my first ever contact with the Apple Community so I'm slowly trying to figure this out as well. 
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    Re: Can't connect wirelessly HP Photosmart C4780 to MacBook Pro OSX  10.8.2 Mountain Lion.              
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    Re: Can't connect wirelessly HP Photosmart C4780 to MacBook Pro OSX  10.8.2 Mountain Lion.              
    Thank you for your prompt response.  This has been a totally frustrating experience.  I’ve spent at least 8 hours trying to fix this.  My HP problems and your initial steps were identical to mine.  I am by no means a tech person and my computer tech knowledge is minimal.  However I followed your steps to the best of my ability.
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    Re: Can't connect wirelessly HP Photosmart C4780 to MacBook Pro OSX  10.8.2 Mountain Lion.                  
    Unfortunately I am unable to offer any further advice as I only followed the instructions listed on the other page.
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