I am new to Mac and I bought an Air in December. I've not had issues with it until this week. 2 nights ago I closed the lid when I went to sleep and when I came back in the morning, it wouldn't re-boot! I tried pressing the power button, hitting some keys (it normally just wakes up), plugged in the charger and hit some more keys. It wasn't until I unplugged the charger and held the power button down for about 10 seconds that it actually came back to life. A msg on the screen told me that I'd shut it down because of a problem. I didn't perform a shutdown at all and it wasn't in the middle of an update when I closed it. I've also noticed the battery life has significantly diminished this week, going from about 5 hours down to only about 2.5. Is that normal this early on? ALSO, when I have the charger plugged in, is the light supposed to be orange or green? I've noticed it goes green for a few seconds, then switches to orange and isn't green again until it's fully charged. When the charger is plugged in, the screen doesn't brighten up anymore - this stopped happening this week. Why? Could I perhaps have a faulty charger? I've tried it in multiple power outlets and get the same result. Help appreicated!