Plug one end of the cord into your phone and the other in your computer
Remove the cord in your computer, leaving the cord in the phone still plugged in
Hold both the home button and on/off button on the phone
Once the screen turns off, let go of the on/off button but continue holding the home button
Plug in the other end of the cord in your computer while still holding the home button on the phone
Once the apple logo appears, continue holding until you see the plug into iTunes screen on your phone
Click restore
http://discussions.apple.com/thread.jspa?threadID=2088600
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