Support Turning on problem

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http://androidforums.com – My samsung galaxy y turned off by itself now when I try to turn it on it turns on until the black screen saying Samsung Galaxy y GTC s5360 or whatever first booting message it is. But it just turns on for 5 seconds and then turns off. I've tried charging it but its still the same. This happened to me once but it turned on after a while. But right now its already an hour and it still wont turn on. please help me. (General)