Hey @Vinshaz18
Sorry to hear about your Fitbit Blaze. You said that the "back green lights are blinking" This is actually a good sign, as those green lights on the back of your Fitbit blaze are meant to be blinking. That is the Fitbit blaze's heart rate monitor.
As for the black screen, have you tried contacting Fitbit's support team? If you haven't, I would suggest doing that to see what Fitbit can do.
Best of luck! Let me know how it goes!
