Endless bootloop until dead.
My mother has had many problems with her 12.2 inch tablet including a flashing screen, overheating, spontaneous crashes, lag in simple games, and finally (the last nail in the coffin) continuous and uninterruptible boot loops. From the moment it is plugged in to the moment it runs out of power again, it loops the Samsung logo. If given enough juice to loop for a while, the screen flashes and the battery/CPU gets very hot. We're hoping a repair will be cheaper than purchasing another brand new.