Try these :
1. Hold volume down and power button for 10 or so seconds.
2. Plug phone into computer via usb. This sometimes wakes up the phone.
3. Hold volume up, power, and home to try to boot recovery mode. If so, wipe cache partition.
4. Use Odin to reflash your stock firmware.
See Odin Section for more info.
Sent from my SAMSUNG-SM-G920A using Tapatalk
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