did you mod your phone in any way?....if not it is most likely a hardware prob...to check it further can u plz do the following?
is ur phone rooted?..if yes set up ADB...take out ur EXT SD
then " adb shell"
and post the output?
Sent from my GT-S5360 using xda app-developers app
Just flash stock rom with odin is enough?
Sent from my GT-S5570I