“ Originally Posted by moocow23 
”
Go to Settings and in the first tab(Personal) go to "Sounds and Notifications." Go to the second tab in there which says Notifications and change the Event to "New Text Message" and make sure you have the box that says play sound checkmarked and if you want it to vibrate just checkmark the last box that says vibrate. If that's the same thing that you did, then I have no idea sorry!
thats the only thing that i can think of too....... unless you have a third party app like phonealarm than you would set it up through that.