You need to get into the boot menu.
Turn on and hold power and Vol down. Release power when it does the first vibrate but do not let go of the volume button.
Its a bit temperamental until you've done it a few times to get the timing right.
Leave your Sim and sd card in.
If battery is dead the led only shows green when trying to turn on so that seems fine if you can get to boot logo.
It's probably having a hissy fit like windows does on a hard shutdown and needs safe boot to fix
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