My Iphone keeps rebooting in a cycle?

It is a 3GS. I try to turn it on and the aple logo pops up. Then it turns black and shuts off again. Sometimes it goes to the main screen for a few seconds then cycles over again. I've tried everything. I even did a new software update, restored the phone and I can't think of anything else

My black 3GS did that. I threw it on the ground a lot. Threw it everywhere. Until I threw it on the ground and it did that. It would never boot up. It would boot up until the iPhone got hot and it would pop up recovery mode all the time. My problem was inside the phone. One of the wires were unsoddered. But I sold it. I'm sorry for your luck… Maybe that's your problem. I don't know. I got a white 3GS then. That was 2011, I had my black 3GS from June of 2010 till June of 2011, then July of 2011 to March of 2012. On March 13th, 2012, I got my black iPhone 4S.

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