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Question: unit will not turn on

My unit will not turn on. The Hello screen scrolls across the front of it but no matter what I tried I can not get it to turn on. I unplugged the unit and let it sit. I also held in the power button for the 10 seconds like the manual tells you and the Hello stops and the time comes on but as soon as I touch the power button the Hello screen comes back on and the unit will not work at all!!!!!!!!