It happened today. I just used my 3 months old Galaxy Note 3 to make a 2 minutes phone call in the car (of course with Bluetooth device) without any problem. Then, I kept it in my pocket after using. At that time, the battery was still full. No phone drop. Five minutes later, when I got home, I took my phone out of the pocket and I saw it completely black!!! I tried to turn it on but...no luck. It sounded a little bit (music), the blue light on top left was lighted in a second then off, completely. Can't turn on anymore. Tried to charge... took the battery off then reinstalled...still not working. The phone now completely died, I guess. What should I do? Actually I dropped the phone once one month ago. There was a little cracker on screen near the power button. However after that, there had been no problem till now. I don't understand why and how my phone stops functioning. Please help! Any advice will be appreciated. Thanks!!!