my macbook air won't turn on when it is plugged in. The light on the connection is orange, not the usual green.
is this the new one or an older model? how long have you had it? check the magsafe connector, are any of the pins stuck?
Orange means charging.
Keep it plugged in for a while.
Reset SMC. http://support.apple.com/kb/HT3964
Choose the method for:
"Resetting SMC on portables with a battery you should not remove on your own".
If this does not help, contact Apple.
For more on this:
Retrieving data ...