Hi guys, my name is John and I'm new on here. I'm 15 and looking to pick up a used MacBook air within the next few months. I've been looking on Craigslist and can't figure something out. Some o the MacBook airs that I look at are either all white or all black including the keyboard, but some are like silver/gray in color with a black keyboard. Can you guys tell me the differance between the two? Thanks!