No sound windows xp

my friend has a computer and when he plugs in the headphones in the front of the computer and plays a cd there is no sound what could be wrong and how can this problem be fixed the computer came with windows xp and he has no internet access. can anyone tell me what to do to try to fix this problem

Perhaps the front ports are not plugged in, try pluggin them into the ones on the back.

yes it sounds like a USB/Audio connection problem,

if you know how, plug the USB/Audio cables into the correct plugin on your motherboard