Hi,

I bought these headphones a while back in the US ( Sony, MDRA S40 EX ) and they were just sitting. Till now when the current one's broke, so i thought i will start using the new one's

But for some reason, I have tried my laptop  , iphone but the earphone does not want to work.

Is their something missing ? I have checked and there is no complicated wiring apart from inserting the 3.5mm jack, am i doing something wrong?

Or is their a problem with usa style headphones not compatible or something ?

Or is it plain faulty product purchased?

Any ideas !!!