I had exactly the same problem with my OfficeJet 6700 Premium. The help tech suggested I plug the power supply directly into the wall; no power strip or extension cord. That didn't help the situation. HP sent me a replacement printer, which has exactly the same problem. If they suspect a weak power supply, why didn't the replacement printer come with a new power supply? I finally disabled the scheduled on/off feature. Now it sits overnight at the higher standby power level, but at least it wakes up and prints when called upon.
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