Hi there Seeker wrote: <Cut>
If you do actually have an audio out and a line out and the line out doesn't produce audio when something is plugged into the audio out, it may be an indication that it's a hardwired mechanical function built into the audio out jack to break the circuit to the line out jack when anything is plugged into audio out.
Systems with headphone jack at the front and a line out at the rear, will often switch of the the line out off when a headphone is plugged in. This feature can usually be switched of by means of a jumper on the motherboard.
Consult your motherboard documentation. <Cut> Regards, Rob