After a regular shutdown, the Chinese tablet behaves like a brick. What could be?

Question

Android

The other day I got a tablet with Ali ( www.aliexpress.com/item/10-Inch-Original-3G-Phone-... ), everything started up ok, I installed must-have software, it worked without glitches.
I decided to reboot normally (through "turn off the power of the tablet PC") - turned off. Turn on - it does not turn on, I keep holding the knob, but he is completely dead. What could it be? I squeezed (presumably) the keys for a hard reset, maybe not the combination xs ... zero.
Was a day connected to the charge-the battery must be charged.
Charging seems to be working - put it in a mobile phone, charging ...
Update1
If you put the charge in and lean your ear against the tablet, you can hear the noise from DC-DC, probably. What a good sign.

Answer 1

It is hard to say. It can be both software and hardware.
Try to disconnect the battery in any way, if it is non-removable, then look for the button in the hole and hold it down for 3-5 seconds, if this does not help, then either to the service or ask on w3bsit3-dns.com