Not Recognizing External Hard Drive Mac Book Pro

Good Day!
I have a 2010 Mac Book Pro that I just downloaded the neww OS X Lion for the upgrades ext... I haven't had any other problems exept that before I downloaded the Lion my Mac would recognize my external hard drive (WD passport).  And now it doesn't, I even go to the finder and it doesn't even show up under "computer"  to make sure there isn't anything wrong with my external hard drive I plugged it into another mac that doesn't have Lion and it would work.  Please Help because my external drive has everything 1TG of everything...
Thanks!!!

Hi,
I had already checked in Finder's Pref's for the check mark for External Disks and it is checked.  That is for external disks to show up on your desk top. 
So still no luck for my Mac to reconize my external hard drive with this new OS X Lion Program.  Should I just take my computer into the apple store?
Thank you!!

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