When you sa you plugged it in, how long did you wait before attempting to turn it on? There is a possibility that the battery went completely dead. If that's the case, it may take awhile to get enough charge in the battery to turn it on.I have a MacBook Air that I bought in 2012.
I was recently away on a hiking trip and haven't used it for 30 days, now it won't turn on...
When I plug it in, only a dim green light appears on the charger.
I fear that since I didn't use it for a month that perhaps it has gone into a deep sleep or something, but I don't know. My MacBook Air is no longer under warranty. If anyone has any guesses as to what is happening, please share! Any advice would be greatly appreciated