SMART ALX: Check also your current supply. I had this happen once, I thought the central unit is out for sure, but it turned out simply to be a badly plugged cable. The monitor would react to a low current, but the box won't.
(esconder) Se apenas lê regularmente alguns fóruns, pode adicioná-los à sua lista de fóruns favoritos indo à página desse Fórum e clicando no link "Adicionar à minha lista de fóruns favoritos". (pauloaguia) (mostrar todas as dicas)