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turn device over and look for tiny reset button near to power connect strip. then use a blunt safety pin to reset,this should allow you to then turn it on,this works on 500 ,700 ,900 , 510 , 710 , 910 , hope this helps .
Did you charge the unit over night? When they are brand new, the batteries are not always charged. See if the lights and screen come on when it is plugged into the charger. If so let it charge over night and try turning it on again. Otherwise, you should probably return the unit.