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Sounds like it is not charging.
The unit will power on momentarily if low batter but power off straight away
Get an electrical competent person to check the output of the power unit or use know good unit.
I have same problem as you have: the on /off switch completely not work . It cannot start only way use the reset pin then cannot off.Mine also has freezing problem.I went to setting then go to factory reset erase all my data. The freezing gone but the on / off switch still not work then I think this could hardware problem. Only way is open it up.Since this is a traumata act I have to use as the last act.Meanwhile I set the display screen close in 2 minutes when want to stop it.Any one here have any better idea please help.
The simple way to tempary solve this problem by just use a pin to insert to the small hole next to the power supply hole.this will turn off the set and start from begining(not reset to factory setting).If your problem back again then need to consider to go to backup and reset to reset to factory setting.It will lose all your data.If still not work contact the factory and install update firmware./