Try holding the top power button and the home button down together for 10 seconds, Failing that plug it back into ITunes and try and do a restore and if that don't work panic
Mine did this last year, I found the fault code and had to download OS5 then plug phone into iTunes. Whole thing took about two hours to reset itself and I lost all my songs/apps/contacts/photos I had added to the phone for months back to when I last sync'd it. I now try to sync more regularly........
Try holding the top power button and the home button down together for 10 seconds, Failing that plug it back into ITunes and try and do a restore and if that don't work panic
As Paul has said, hold both buttons unti lthe apple Logo comes back on then let go of the top button
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