I had the same problem!
Holding the Power Button DID work. However, it took about 12 seconds for it to power on.
Once it powered on, it shows that the battery is at 96%
It's always been on the same charger at night when I go to bed.
Will try the same charger again tonight. If it was a “fluke" then GREAT!
If not then will try different charger/outlet tomorrow. Will update!
P.S. I also have an ONN TV which experiences periodic static charges which causes volume changes. It needs to be unplugged for a minute (or so)…
Once plugged back in, it works perfectly!