My Iphone 4S keeps flashing between the Apple logo, blank screen and sign in.  It will not let me sign in, nor can I power it off.  Help!

My Iphone 4S keeps flashing between the Apple logo, blank screen and sign on screen.  It will not let me sign on or power off.  It started about 20 mins ago.  One of my friends started having the same issue at the same time.  How can I fix this?

Hi Bucky16,
If you haven't already done so, you may want to reset the iPhone:
iPhone, iPad, iPod touch: Turning off and on (restarting) and resetting
http://support.apple.com/kb/HT1430
If the above does not resolve your issue, the next best step will be to restore your iPhone using a computer with iTunes:
iTunes: Restoring iOS software
http://support.apple.com/kb/HT1414
Thanks,
Matt M.

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