My Iphone 4 is turned off and will not turn back on?

I have tried plugging it into the computer several times but Itunes cannot find my device. Also I have plugged it into charge at the wall and it is not turning on or charging. I do not understand how this problem has occured as to start off with it came up with the apple logo but then I use DFU mode plugged it into my computer it downloaded IPhone software onto it and then nothing else happened.
Please comment, I really need my phone back up and running.

Charge with the mains charger for 15 minutes, then disconnect and hold HOME and SLEEP until an Apple logo appears (about 10 seconds).

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