exact same thing happened to my phone too....lol

ur fine...just hold ur power/sleep button and ur home button together.....ur phone will turn off and turn on again....STILL HOLD BOTH THE BUTTONS.....itll turn off and on again.....as soon as u see the apple logo let go of the power button.....KEEP THE HOME BUTTON HELD.....ur phone should enter DFU mode.....ull see an itunes icon and a usb cord on ur phone screen....
after this point....restoring it is a breeze.....just follow the guides.....
look in the jailbreak/unlock/activate section....


hope this helped....
