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.