Why has my iPhone 4 shut down and why won't it turn back on?

Please help! My iPhone 4 has randomly turned itself off and I can't get it to turn back on again. It was fully charged last night, but despite this, I tried plugging it in again in case that was the issue, but nothing. Worried I'm going to lose photos etc!

Are you SURE it is charging indeed?
Dunno on the i4's, but on my i5 I get visual confirmation in the guise of a green "battery" displaying the state of charge when I initially plug the USB adapter, plus a special tone. So I can be sure that juice will flow in.
Your problem description begs crying out "bad battery" and/or "bad cable". Try with another USB cable first as the easiest thing to try.

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