Exactly what to do depends on what is happening. So:
- Does anything happen when you try to turn it on?
- Does the light under the switch do anything?
- Does the screen flash? Does the frontlight come on?
But, the things to try are:
- Charge the device. It doesn't matter what you think the charge level was before, just assume that something has run the battery down.
- Hold the power button down for about 20 seconds. Release it and turn it on again.
After that, it depends on what is happening. A factory reset might be needed. Or you might need to restore an image to the internal SD card.
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