When you say it won't turn on, do you mean, there is no spin-up and not LED. If this is the case disconnect it from the power source and then reconnect it. If the LED flashes once or doesn't appear at all, the power supply is faulty and you will need a replacement. If you call WD, they will send you a replacement power supply free of charge.
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When you connect the PSU to the drive, does the light, at the back, come on or flash?
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