Hello everyone. I'm new to macs and laptops as well and I have been having a pretty annoying problem with my macbook. At random and sometimes very frequent times my macbook will just go to a black screen as I'm doing something and the white light will just stay lit, not pulsing, so I guess it's in stand by mode? It will take a few seconds for it to start pulsing again and then I will wake it up and the screen will come back on. This gets really annoying when I'm in the middle of a lecture for class and then my mac goes black on me so I was wondering what I need to do to fix this, just send it in? Also, with the macbook power adapter plugged in, it says my battery is not charging and only at 90%. I've only had the macbook for about 8 months or so which has kind of bummed me out. Any kind of help would be awesome. Thanks a lot!