Hi thank you for that information.
The problem is a failed jack for your head phones. I know the issue well/ You can try plugging and unplugging the headphones a few time to see if that helps, but it might not.
To fix this you will need a Keyboard repair shop to fix this for you or you can take this one to Best Buy or Sears and they will send it out for this fix ;-)
They are both reliable and fair priced, also they do excellent work;-)
But... I would check the exact age to be sure your keyboard isn't less than 1 full year old first!
If its less than ! year, it is still fully covered under its warranty and if that is the case, then please call Yamaha, using the phone contact info in your user manual and on the warranty card for free repair service.
In any case, I will stick with you until this is complete.
Please rate my service kindly.
Also it is the only way I am credited for my time and expertise with you.
Once you rate, I will be notified and will add your question to my priority list so you can reach me anytime until this problem is solved.
Then you can reach me by simply replying to this message anytime.
Thank you and have a great day!