I tried all the tips ie. holding buttons on and off, opened the case and disconnected and reconnected the battery etc.but nothing worked! This morning my wife called me and excitedly showed me the tablet was working. I couldn't believe it when she said she shoved it in the fridge for an hour and when she took it out and switched on it worked perfectly. Said she had read of someone putting a phone into a fridge and thought she would try the same trick! Happy lady!