Okay, so I got a macbook a week ago, it had 3 dead pixels... I gave it my uncle to exchange it for a new one. So he got the exchange after a light hassle. He gave it to me today, and he told me had opened it up and booted it and all to check if there were any problems before giving it to me. So when I got it today, it's apparently charged 60% and he did the first boot and all.. and god knows what else.. But I wanna do the first boot, so is there a possible way to just restart absolutely everything? I wanna go through the whole settings part of it and whatever. Also, he obviously did not follow battery calibration rules, it's charged at 60% when he gave it to me. Should I let it drain now and then calibrate? Or should I charge it to 100% right away then drain? Thanks guys.