Simon Cunningham

I recently encountered this same issue with my son’s SM-P580 model tablet. Using the Power Button + Power Down combo the best I could achieve was a brief backlit on/off, then nothing. The only way I knew it was on was due to notification sounds. I cracked it open and disconnected the battery for at least 30 seconds. No dice. I then disconnected both the LCD ribbon and the ribbon right next to it, reconnected both, and then the tablet started working normally. Phew!