Hello @ET5, welcome to the community!
I'm really sorry to hear about that! Have you tried holding down the ON/OFF button and the Volume Up button at the same time to force a shutdown, and then tried to start it again? Here (Clickable link) you can see the buttons marked as number 5 and number 6. You can also force a restart if you remove the back panel and with the tip of a pen or similar pointy object press the small OFF button showed here (Clickable link).
Have you had the opportunity to remove your SIM and/or SD- card? A damaged card can cause this behaviour. Remove your card and try to start the phone again.
Does the LED-light (marked as number 1 in the overview) light up if you plug it in to a charger? If The light shines red, your battery needs charging. Let the phone charge for at least half an hour before you try to start it again.
Keep me posted! I would love to know how things work out.
