sure that the power button is not damaged, press the power button. if functioning correctly, there should be a green or red led light on the side of the device that turns on. if the power button is not functioning it will need to be replaced.
the upper screen on the device has no picture no matter how many times i press the power button!
the back light can be accidentally turned off in the settings of the device. there is an alarm setting that can cause the back light to turn off after a certain amount of time. another issue with the settings is that the back light can be turned 