MBP not seeing my LaCie external drive

I just realized that Time Machine was backing up my Mac Mini to the LaCie hard drive these many months after I bought a MacBook Pro, and thought I better get it to back up my MBP instead, since that is where I have most of my activity these days.  After realizing that doing it wirelessly was taking forever, I tried connecting it with a Belkin 800/400 FireWire.  No LaCie icon on my MBP desktop, in Disk Utilities, Finder Sidebar, nothing.  I saw some posts about making sure the Finder Preferences had the external hard drive option checked, and it does.  The place where it DOES show up is in the System Profiler.  I also tried connecting it with USB, and still no go.  Anybody got any suggestions?  Thanks.

Have had this problem for a week now. I might add that connecting directly with Airport Utility using IP works fine, but Time Machine still doesent work.
This fix worked for me:
http://discussions.apple.com/thread.jspa?messageID=7105052&#7105052

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