Lacie external HD not appearing on desktop but recognized in disk utility

Hi,
I have a Lacie 1Tb external HD. It worked fine when I first purchased it about 4 months ago but recently when I connect the external to my MacBook, it is not recognized in Finder nor does it appear on the desktop. However, when I open disk utility the external is recognized but I can't verify or repair it and there is no "mount point" associated with this drive. Has anyone encountered and fixed this type of problem.
Thanks

Try verify/repair the hard drive with disk utility.  http://support.apple.com/kb/HT1782

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