I write this post to say goodbye to a stupid and stubborn religious belief in the perfection of Apple's products. Once upon a time, I believed in the quality of Apple's products so tenaciously like I believed in communism when I was seventeen or eighteen. I lived in China, and was brainwashed to believe in communism then, and maybe then brainwashed to believe in Apple's products. And now, the religious belief in Apple's products suddenly collapsed because one day my MacBook Pro early 2015 suddenly won't boot. It's just half of year since I bought it. I couldn't believe it then. How can a new laptop won't just boot? I have a ASUS laptop more than three years old never once can't boot. I installed XP, win 7, win 8, win8.1, win 10 preview, win 10 on it. It never once can't boot! Maybe some people think I am paranoid just because this single, peculiar, uncommon case of my macbook. Maybe my macbook is just a single flaw of billions of Apple's perfect products. How can you negate the perfection of Apple products just because of a single failure? I share this doubt too, I also thought this was just a single peculiar case. And then I have the macbook sent to Apple retail store to check and repair. A few days later, they told me nothing is wrong with the macbook. They just unboxed the battery and got it back and the macbook can boot again. So, it seems nothing is wrong with the hardware. But the retail store didn't give me any details about the cause.