okay, so all of today my headphones haven't been working. what happens is, i listen to something(on itunes, youtube, tumblr, anything) and instead of hearing it normally it's super choppy. like most of the time it's silent, and then every few seconds i hear a very short part of the sound. is there something obvious i'm missing that i can easily fix, or are my headphones completely busted? helpful answers only, please.
EDIT: also, i'm using USB headphones, and the only other ones i have are kind of smashed up