Hello all I am in desperate need of a small problem with my new/used MacBook Pro. It's a 2012, I bought it off of craigslist. Anyway, you know the sound the laptop makes when you press the volume keys? That original apple "popping" sound? Mine doesn't do that. I did go into settings and try to get that sound but it's just stuck on one sound. Not sure what the name of the sound effect is, but if I try to change it to another sound, it plays the preview but when pressing the volume keys the same sound effect remains, it will not change. I'm not even sure what the original sound of the macbook volume key is called, but I can't find it, nor will my pro change the volume settings. It's almost like it isn't saving or something. New to macbook have no idea what I'm doing wrong, can anybody help? Please