No Sound On My Galaxy Proclaim Andriod Phone?

I've only had this phone for two monthe; and all of a sudden I noticed that I have no sound.  I can't hear the phone ring, can't get any sounds to play at all for any thing. I have tried the volumn controls in the sound settengs and where ever else I can, but to no avail. THIS IS VERY FRUSTRATING.  I use my phone for business.  I updated from a regular straight talk phone to this one and this one is causing me a lot of problems and trouble AND TIME!  can this be fixed? thanks,   Connie