Hey Coney, It should switch off when you plug the headphones in. There is a switch inside the port which opens when the headphone jack is plugged in, switching off the speaker. Are you sure you're headphones / earbuds are fully plugged in? You should feel a click and maybe hear it also. Check the headphone port for foreign debris, lint, dirt, etc., if you see anything carefully remove it. Or if clean, try quickly plugging / unplugging the jack 10 to 12 times to free the switch and/or clear contacts. If this does nothing, try a reset, or last resort, connect to your computer, make backups of all your stuff on the iPod to your computer first, then Restore to New. If problem continues after a Factory restore, you most likely have a hardware issue, contact your Apple store or Apple Genius Bar and have your iPod evaluated. Good luck, Cheers.