My iPhone 4 isn't turning on, only showing the black screen with the apple logo...HELP!!!

My iphone 4 was working fine, I went to check the time & it was off & wouldn't trun back on.  I've tried restarting it, then tried to restore it and neither are working.  I'm getting an error message from iTunes saying "The iphoned could not be restored. An unknown erroe has occured (21). "  I am on a PC and my itunes is up to date.  This has never happended before & I wasn't using an app or really even my phone when this happened.  If there are any other solutions please let me know.  I'm not going to be able to get to a service person for a couple of days.  Any help would be useful.

put the iphone into recovery mode by
1. Hold the power button until Iphone shows logo then hold down home button make sure iphone is connected to the computer.
2. The computer will do the rest if it doesn't connect to the computer then these steps are useless but u can still try

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