In my case, it was important to push the three buttons again and to try it in different stages of the "restarts". I'm more than convinced that there is connection with the Android 11 update, more strange software things started after the upgrade. Now...
Today, I got exactly the same issue - the screen got blue and while charging there was no LED on. It seemed totally dead and I thought that everything was lost, but then I put it in the charger (maybe this step is not so important) and I pushed POWER...
