HT201401 iPhone turned off unexpectedly and will not power up.

it wont turn on and displays the apple logo, when plugged into mains power it says connect to iTunes. Yet when connected to iTunes the phone does nothing except display the apple logo repeatedly?
Any help would be very much appriciated.
Also to add, all softwear is up to date???

See Here  >  http://support.apple.com/kb/HT1808
You may need to try this More than Once...
Be sure to Follow ALL the Steps...

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