No sound in preview

On my v551, when i try to play mp3's or videos i get no sound, i used to but now i dont, the sound works fine when its set to a ringtone but not when i try to preview it. Does anyone know whats wrong and what i can do to fix it?

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try a reset

are you sure that you hit the play button? With my old phone, it would play when you hilighted it, so at first I thought my v551 was broken.

I dunno, maybe your smarter than me. lmao

Ya, this happens even when i hit the play button, and for the reset, what does that do? How do i do it? Will it delete all my pics, music files, phone numbers if i do?