Answer to "iPad doesn't charge after battery drain"With these details we can't exactly help or at least describe but if you go to Apple they replace the charger and inspect the product its self. I was thinking that if it has some sort of overlapping ridge on the charger that is it problem and you must go to Apple for that or else your iPad will become bro land you won't be able to access it. I'm sorry that this is probably not the answer you were hoping for but this is the closest I can get with these details.
Answer to "Can I replace my mouse?"Yea also if you would like to get a guaranteed mouse go to the Apple Store and sometimes if you bring a product of theirs and their is not simple solution it whatever cause they give you a free product in this case a free mouse of your choice.
Answer to "How do I get my music to play through my earphones?"It simply is just bent it was bent so long so unless you straighten up the wires it will not work. I advise you to get a new headphones. That is the only solution.