this is really obvious but have you tried changing chargers or anything? When it tries to reboot does it make this strange beeping noise? It did with me and every time it stopped the screen would flash for not ever a second and would go back out! So I changed the charger to one of the ones I got in the box and it turned on! However what I learned that when my tablet turned on it was trying to turn on it just didn't have an battery life! So try to change the charger to one that has the white lightning bolt instead of the one with the white lightning bolt with the "x" over it (even though it may charge like that) and make sure its a good outlit