Somthing is wrong with my skullcandy cord and i can only hear out of one headphone

When headphones get old or are used often, they tend to break. If you wanted to fix it, here's a video on how: 
http://www.youtube.com/watch?v=_mSNCuZ9hho
Still, it would be cheaper and easier to buy a new pair. A high quality, long lasting and moderately priced pair of headphones are these: 
http://reviews.cnet.com/headphones/v-moda-vibe-gunmetal/4505-7877_7-32161239.html
They are made in a way that makes them long lasting. Also, their bass and treble (for the price) are unmatched. I've had mine for over a year and they sound as good as day one. They start at 20 bucks. 
Hope this helped!