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1st open all the flaps and look for white rectangles, if you see pink or red rectangles then there's water damage
or
2nd you can test your phone
https://play.google.com/store/apps/details?id=com.sonymobile.androidapp.functiontester
3rd you can repair your phone with
Update Service (SUS)
PC Companion (PCC)
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
