HT5234 what if the if the light does not turn on when plug in?

What if the the light does not turn on when you connect you adapter to you macbook pro?

I'm going to go ahead and assume that you're talking about your MagSafe power adapter.  Mine does this occasionally.  Generally, if I turn it over, the light shows as lit on the other side.  Sometimes I do have to plug it in a time or two before the light on the adapter will turn on (orange or green).
For more information, see this article:  http://support.apple.com/kb/ts1713

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