My macbook does not recognize my external hard drive

I have a brand new external drive which I have already formatted in FAT32 and previously used in my MBP with no issues at all. From a couple of days ago though it simply ceased to appear on my Desktop, Finder or Disk Utility. It is, however, recognized in the System Profiler or System Configuration when I click on the USB port tab. No physical damaged has been applied to the HD, and the light turns on normally, making a perfectly normal noise. As I said, it used to run just fine on my MBP, and even on other Mac computers and PC's.
I took it to a store with Apple technical support, they plugged it into one of the store's Macbooks and, surprise surprise, it magically appeared and worked perfectly. They even tried it on a Windows PC and ran just fine. Came back home, turned my computer on, connected it and the problem persists....
Any ideas?... Can you help me?
My specs are:
15'' Macbook Pro 5,1 with an Intel Core 2 Duo 2,4 GHz processor and 8GB of RAM
Mac OS X 10.6.8 fully updated
Western Digital Hard Drive - WE Elements SE Portable WDBPCK0010BBK-01

Did you get a solution for this issue ? I have the same HD which works fine on two other Mac Book pros (Snow leopard and mountain Lion) but does not work on a brand new mac book pro with Mavericks

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