I posted previously about my problem with my Mac and the whole charging thing, in short when I charge my Mac it does not correctly show what percentage the battery is. When I open the lid it takes about 5 minutes to show me what the charge actually is on my Mac. I was going to call apple about this today, because it is a small annoyance that I was hoping could be fixed. Well, about a half hour ago I was on my Mac on safari when my screen went black. They keyboard was still lit up and I held in the power button and nothing happened. I closed the lid for a couple minutes, opened it again and still the screen was black and the keyboard was lit up. After about 10 minutes it started up again, completely rebooted and then brought up all of the windows that I had opened. Im seriously concerned about this because along with my notes for school and my papers I also have a lot of stuff on my Mac that deals with a lab that I work in. Im so frustrated with this right now, and can't call Apple until after class. It seems like the performance is deteriorating on my mac since the Mavericks update. I have a 13'' MBA Mid 2013. Sorry if I am reposting something that was already posted and being redundant, but I just wanted to know if anyone else had this problem, and if there was something that I may be able to do to fix it. Its just such an inconvenience because i've literally integrated my entire life on this computer (which is something I have never done in the past with any other computer).