My iPhone 4 just shut off and after charging all night still won't come on

My iPhone shut off after using it and charged it all night it still won't come on How do I fix this?

See Here for  >  Frozen or unresponsive iPhone
Try this First...
Press and Hold the Sleep/Wake Button and the Home Button at the Same Time...
Wait for the Apple logo to Appear...
Usually takes about 15 - 20 Seconds... ( But can take Longer...)
Release the Buttons...
More Info here...
https://discussions.apple.com/message/19521062

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