I have an Ellipsis 7 that will not power on. I have replaced the battery and charging port, but that has not made any difference. When I press the power button, I can see that the backlight of the LCD comes on, but the start screen never comes up. I have tried hard resets using Power + Up Volume as well as Power + Down Volume. I have performed a power drain by disconnecting the battery and holding the power button down. Reconnected battery and tried to power on and hard reset, and still the backlight comes on but the start screen or Android never comes up. I'm out of ideas. I'm thinking the motherboard must be bad? Thanks.