My HP Prime G2 stuck

[Amaral Pascoal]

Hello.

I have problems with my HP Prime now. please, help me! the buttons are swapped (the "-" decreases the screen brightness and the "+" increases the screen brightness; the "divide" goes to the terminal screen"), and every time I press "Esc", it goes to an "Exam Mode" screen, that has "Configurations - Basic Mode" and to choose the angle. And the Symb button reset. It also does not turn off... I press "shift" and then "off" and it does nothing. And seems like the "On" button is stuck. When I hold down the "On" button, I can change the screen brightness with the "+" and "-" buttons, divide goes to the terminal screen, and Esc goes to exam mode. Please, you can help me? I am from Brazil! Sorry for my english.