The right earphone do not play sound but left is OK
What can I do?
Gonzalo, take a can of keyboard air cleaner, you can buy those at any dept store. the ones you get to clean your keyboard etc. Hold your ipod upside down and blow a few puffs of compressed air into it. Take your headphones and plug it in and out a few times in succession, since this may free the stuck contact. If that should not work for you, you will have to replace the headphone jack. Good Luck