Phone Samsung galaxy S 4 don,t power on

hello every body,
I got a Samsung galaxy S4,but yesterday i try to charge it. he charge normaly but when i power on this last, it's show me SAMSUNG GALAXY S4
I 9505 and nothing else.
I try to entrer in Bootlaod but it the same thing i seen. I remarke that when i remove the charger it power of automatically.
is there somebody to help me?