Well, for starters i am new to macs, i bought a macbook because i could run windows on it and after about a week or so i basicly fell in love with os x and never used win xp unless i wanted to play a game. My first problem was the yellowing and then the random shutdowns... so i sent it in, waited 2 weeks and i got it back yesterday, what did i find? a perfectly working computer, BUT full of scratches all over the case with 3 nasty deep black scratches, not only that but the vessel around the keyboard was brownish and also had tiny scratches, but wait! thats not all! there was also a nasty bump on the bottom of the computer as if someone hit my computer from the inside with a pen or a screw driver.... thank you apple.