What can i do if the iphone is keep on restart and after it stop restart, it stay at the apple start up up screen which is the apple logo in the middle??? Can anyone help me??

i've trying all night long. after i reboot my phone, it can't start up anymore. it just restart for a several times and it stay at the apple logo which is the start up screen. What is happening to my phone???

You need to use recovery mode to restore:
http://support.apple.com/kb/HT1808

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