Why is sound only coming from one of my headphones?

Q: I have headphones plugged into my laptop, and yesterday noticed the sound was only coming from the left one. I checked the audio control, and everything is fine (sound should be balanced). I also checked the speakers without the headphones plugged in, and sound comes from both of them. I thought it must be just the headphones, so I bought new ones today, and the problem is the same! Any help appreciated! Thanks :) Ugh... sorry... should have tested them on my mp3 before I asked. No, they don't work. So weird that both sets of headphones are bust on the same side.... Sorry for my dumb question!

A: Do they work on MP3, IPod etc?

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