Push the power and volume up button down at the same time for 10-20 seconds.
Try that twice.
If that does not work, try charging the device via the computer. You might have a bad charger and the tablet simply is not getting charged. Leave the device charging by the computer for at least an hour. That won't give it a full charge but it might let you know that the battery simply was not previously charged enough for the tablet to activate. If that doesn't work, try the Cambio support page.
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