My phone although fully charged has just switched itself off and won't turn back on again! I'm just coming to the end of a 2 year contract and never had any problems with it. Help please!

My iPhone 4 although fully charges has just switched itself off and won't turn back on again. I've tried taking the sim card out but nothing happens. I'm just coming to the end of a 2 year contract and never had any problems with it before. Help please.

Start here
http://support.apple.com/kb/HT1430

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