iphone 4 turned off wont turn on

Iphone 4 Turned off and wont turn on
location: apple.com - date: November 21, 2010
I was playing with my iphone, put it in my pocket for 5 minutes, took it out and it had turned off and wont turn back on, ive tried starting it with the power and menu buttons and itunes wont pick it up
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my iphone 4 just turned off and it wont turn back on
location: apple.com - date: June 20, 2012
my iphone just turned off randomly and it was charged and now it won't turn back on
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