How do headphones work?
Headphones are essentially small speakers, with small wires and a standard plug. See the Related Link for "HowStuffWorks: How Speakers Work" to the right for more information.
My understanding is that when you plug your headphones into the computer and try to play a song on iTunes, the sound does not work. The first fix to try is to make sure the headphones actually connect into the computer and work. Some headphones do not work with some ports in the computer for headphones. The second possible fix is to make sure you are plugging it into a headphone slot and not a…
Computers do not need to 'register' headphones for the headphones to work. If the plug side of the headphones fits into a port side on the computer then problem solved. You may need to get different headphones (earbuds) if the plug on the earphones is too large for the available ports on the computer