Thought I'd share how I've fixed mine. This is the second time my fitbit has just died. Black screen and wont turn back on in about 6 months. To fix this just attach the charger hold the left and bottom right buttons while removing and reattaching the charger. Takes about 15-20 seconds of messing with it and the fitbit screen will come on. It's worked for me twice now. The first time it was off for about a week until I tried this method. Good luck.
