First of all, I suggest everyone to purchase an apple care service. My laptop can't recognize the usb drive in the summer. The Genius Bar replaced the mother board. During the past two months, the SSD of my laptop died several times. They replaced the SSD. When they gave the laptop back, I found there was a huge mark on the screen which was can't get rid of, Genius Bar decided to replace the screen. By now, if I don't own the apple care, I would have to pay at least $1700 to fix my laptop, but now they're all free. I don't know I'm lucky or not, but I'm wondering what will happen once my laptop beyond the warranty! : (