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If your device will not turn on it may be a result of low battery power. Ensure that the device is correctly connected to the charger before attempting to power on again.
If your Ematic EXP8 turns off spontaneously, this could be a result of insufficient battery power. Ensure the unit is correctly connected to the charger, and let charge fully before using again.
It is possible that it this could be due to a faulty charger. Replace charger.
Use volume controls on top left side of the unit to make sure the volume is turned on. If turning the volume up is unsuccessful replace faulty speaker.
Look for any damage on USB cable, if damaged replace USB cable. If USB cable looks undamaged it could be the operating system's inability to support unit. Check the manual for systems compatible and install or update a compatible operating system.