External Hard drives usually draw more current (power) from the PC's USB port and some times even the power being provided by PC's USB port is too less for HDD. In both cases the HDD tries to start but will eventually fail. To cater this you need to buy USB cable with two USB connectors at PC end. Plugging both the connectors to the PC will draw required power from the PC and your HDD will work fine. Also try to connect your HDD to some other PC and see if it works their or not.
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