I had the same issue. The solution for me was to swap the old USB cable I was using with a previous smaller USB drive for the cable that came with the drive. The USB 3.0 connector into the external drive is slightly different than the old USB 2.0 connectors. For whatever reason my mobo hated that setup and reset itself with the only error reported in the computer management event viewer being a somewhat ambiguous one that related to a possible loss of power.
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I had the same issue. The solution for me was to swap the old USB cable I was using with a previous smaller USB drive for the cable that came with the drive. The USB 3.0 connector into the external drive is slightly different than the old USB 2.0 connectors. For whatever reason my mobo hated that setup and reset itself with the only error reported in the computer management event viewer being a somewhat ambiguous one that related to a possible loss of power.