Yamaha DTXpress/DTXplorer/DTXtreme

Help,,, I cannot use my headphone jack now. I have a pair of closed 
muff headphones that I bought last week and have used them with the 
module and they sounded great. Now the jack is dead. I have also tried 
a pair of sony HP's I have to no avail either. I have plugged the 
phones into my stereo and they work just fine.

Is there a setting in the Module that can turn these off. I have done 
a master reset and this does not work either.