My iphone screen has gone completely blank I have tried holding down both the sleep and home buttons and nothing has happened and I have tried to connect it to my laptop but itunes will not recognise, what can I do ?

My iphone screen has gone completely blank I have tried holding down both the sleep and home buttons and nothing has happened and I have tried to connect it to my laptop but itunes will not recognise, what can I do ?

have you tried charging the device ?
if so and it still does not work you can try a Forced Recovery..
by holding the HOME button down and plugging it into your computer at the same time..
http://support.apple.com/kb/HT1808

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