Originally Posted by sitlet
It should work. Are you sure you are using a 3.5mm cable and not a 2.5mm one? Are you sure its a stereo cable and not a mono cable?
If it was mono there should still be sound out of the left channel, the right channel would cause a short and there would be no sound but as long as the stereo isn't too old (20+ years) there should be no worry of damage.