Method 1: When the battery is too clean, it will enter a dormant state and the phone will not turn on. The correct way to do this is to charge it for more than a few minutes and it will start normally. If this does not work, press Volume + and Turn on the phone at the same time. The key can usually be solved.
Method 2: This should be the reason for the MIUI update. Press and hold the power button for more than ten seconds without letting go, and it should be fine.
Method 3: Plug in the charger and keep pressing the power button for about two minutes.
Method 4. Apply for return.
Xiaomi tablet