My iPhone speaker is not functioning right?

My iPhone speakers will not make any noise when i try to watch a video, listen some music, or even make that click sound when you type or when you turn it off. It does make the ringtone sound though, so i don't know what could be the problem. Can anyone help me out with this issue?

P.S: for some reason when i plug in my iPhone charger core into the Iphone port, it spills some type of black ink onto my charging cable

My phones all have different volume controls for Media, Ringtone and System sounds
each can be put all the way down. Check to see if the Media and System sounds have been turned down.

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