Samsung Tablet SM-T580 (Galaxy Tab A 10.1) WiFi Only 4 months old as of 11 Sept 2017 Wouldn't show charging. Wouldn't turn on despite being on a reliable charger all night. Completely unresponsive even after trying multiple different chargers and cables . Removed Micro SD Card Tried the Volume up +power thing for 15-20 secs... No response. Pressed power and DOWN volume at the same time for 15-20 secs. Charge screen popped up, pressed power and it turned on. Hope this works for someone else.