Hi aeroyang12
Welcome to BlackBerry Support Forums
If green light is flashing , then it might be possible that your battery has completely drained out .So please connect it with a good wall charger it let it charge for a few hours, Don't try to turn on your device again and again. After a few hours say 2 hrs while it is connected to the charger remove the battery from the back of your device and then re-insert it back , you can do this sequence every 2 hrs to see if that helps .
Try it or if you can manage a good fully charged battery try that on your device to see if your device boots up.
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