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1. In many cases, we've found that a dead battery is the cause – before trying anything else, make sure to charge your One!
2. Power cycle the One by holding the Power button for 20 seconds 5 times.
3. Attempt to start the phone by holding down the Power button along with the Volume down button to start recovery mode and performing a factory reset.
If these do not solve your problem, submit a support ticket and we'll help you further.