Yamaha Full-Size Keyboard "sound barely comes computer speakers" Questions

...sound now comes out of right speaker and not the left the problem is with your sound source (computer, IPOD or whatever) or the connecting cable is faulty. If there is still no sound from the right ...

...sound from Yamaha keyboard it was fine until one day it cratered for no apparent reason, making only scratchy barely audible sounds and now it is totally silent. I want some one to come here and fix ...