You should try moving the drive to a new case, your Ext.HD's case might (or possibly could) have some kind've internal problem (?)...
...I have a Packard Bell 3500, which doesn't work on my PC. Which the only reason it doesn't work on my PC is because it requires a certain driver (and strangely enough it's not a driver available for Vista), thou it works on the PC running WinXP in the next room. Maybe your laptop needs a driver? Which can be obtained from a few online sources, such as the manufacture of the Ext.HD which the manufacturers should hold drivers for all their products.
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