My sister-in-laws 2011 macbook pro 13" wont power on, nor does the indicator like on the Power Adapter come on. I've tried a known working power adapter from another 2011 Macbook and it's fine. In fact, the power adapter from hers works fine on the other 2011 macbook. I'm wandering what i should look at first or things to try to at least get it to come back to life to get data off. I don't mind taking it apart. Any ideas what the issue is? anyone see this before? Thanks!