My iphone 4 turns off and on when ever i try to reboot and turn off each and every 5 second?

hi there,
            my iphone 4 turns off and on in each and every 5 seconds when ever i try to reboot and turn off. i was just trying to get ridge of this things. so culd u help me plz !!!

Try:
- iOS: Not responding or does not turn on
- Also try DFU mode after try recovery mode
How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
- If not successful and you can't fully turn the iOS device fully off, let the battery fully drain. After charging for an least an hour try the above again.
- Try on another computer
- If still not successful that usually indicates a hardware problem and an appointment at the Genius Bar of an Apple store is in order.
Apple Retail Store - Genius Bar       

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