My tablet suddenly turned off and won't turn back on and it was working just fine up until that moment. What do I do and how do I fix it?
Connect your iPad to its Power Adapter; whist still connected to external power, try a forced-restart:
Note: If iPad still doesn’t turn on, or if it gets stuck during start up, see the Apple Support article If your iPhone, iPad, or iPod touch won’t turn on or is frozen. Or if your iPad isn’t working correctly after you restart it, see the iPad Support website.