Well, if the HDD still works in other PCs and other devices still work OK with the Vostro's USB port, it's quite possible that the USB port's power has always been marginal for the HDD. Have you tried it with a powered hub? If so and still no joy, that would suggest there's been a conflict at some stage that Windows on the Vostro has been unable to resolve and it may require little more than using the System Tools or a System Restore to rectify.
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Cheers,
Paul Edstein
[Fmr MS MVP - Word]
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