They come from a separate power cord. They are connected to the computer by USB.
I've tried both power cords (one rarely used, practically still new) on both HD's, and both HD's had that flickering on and off, and I would have to restart them .
Once again, one HD stayed on all fourhours tonight.
However, my g/f said she tried to bring one into her PC computer and it kept going on and off at first, but after a while of trying, she finally got it to stay on.
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