I thought my tablet was dead because it wouldn't turn on when I pressed the button.
During one last thought before boxing it I pressed AND HELD the On/Off button in for about 4 seconds and, to my surprise and delight,
the tablet came to life and booted properly.
While some tablets might require a long key press others might simply be going through an "upgrade" process of installing new
processes, program updates, etc.
Some times these things take a bit of time so I've found that patience, while often overlooked, saved me that day! Tablet has worked
wonderfully ever since! - ASUS TF300T -
Just a thought....