Support Phone Restarting continuously

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http://androidforums.com – Hi all, My phone Xperia Ray is getting restarted continuously. I searched many discussions and everyone is suggesting to reset the phone to factory settings. But how can i reset it ??? Because the phone is showing the unlock screen just for a second and restarts. Also it is not detected by the computer. I'm in trouble. Is there Any solution friends ??? Atleast to backup the contacts. Thank you (General)