DJM 350 Mixer Problem - Help Please!!!!1

Hey i got a little problem with my DJM 350 and CDJ 350s, i was playing around with my decks when all of a sudden my channel one deck wasnt playnig any music out loud. The mixer shows the levels for the song playing with the lights and i can even hear the song playing on the channel one mixer through the headphones but it does not play out loud. It is not a problem with the speakers because channel two plays fine and all the cords are in place fine. One second i was playing a song on channel one and it was fine, the next i changed the song and it wasnt playing out loud. Can anyone help me with this?