Samsung Galaxy s3 no message notification sounds help needed

[Guest fned]

For some reason my phone has stopped playing a text message notification sound. I have tried about everything there is from settings sound and from settings within messaging but I can't get it to work. 

 

I did notice the Vol up/down button on the side of the phone, if I press say Vol up and the slider bar appears onscreen that , if I press on the cog/settings and I slide the VOL on any of the four sliders that appear no sounds can be heard , it should raise and lower the VOL but it doesn't. All's that happens is the phone vibrates when I turn the ringtone down to nothing.

Anyone know how to fix this ?

Edited August 19, 2014 by fned