Answer to: The sound is messed upclean the jack. you can also try to use a very fine screwdriver or similar tool to carefully bend the outer connection a bit towards the plug...
Answer to: Earphone jack does not work wellclean the jack first. use a q-tip (the thing you use to clean your ears) and alcohol (spirits like vodka do the job). remove some of the padding of the stick until it fits the jack then apply a drop of the good stuff to the tip and clean your jack.