How to turn the sound off on my iPhone?

Ok so i did something to my iphone 4s and my sound works for a split second after it rests and it goes off and the sound bad doesn't even appear afterwards, my friend told me to try disabling it in settings and trying to restart my phone. But how do i disable the sound? Not the ringer the actual music sound

Added (1). The sound bar just disappears. When i double click it whenthe phone is locked, it just goes away. Also when i'm on the home screen when i double click it and slide to the left its not there

Just turn it all the way down. Whenever you're on your home screen, double press the home button, swipe to the left and turn the sound off.

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