Currently Being ModeratedMay 15, 2013 8:02 PM (in response to Naruto04060406)
It is very possible that your mute is off, but your volume is still all the way down. Try turning up the volume with the side buttons.
If that doesn't work, make sure that the app you are trying to use sound in doesn't have an additional mute option.
If that doesn't work, it is possible that the problem lies within the iPad itself, inside the casing. I suggest going to the genius bar to have it looked at.