Flashing Apple Logo on iPhone 4?

Recently, I've updated my iphone 4 which was jailbroken to the new iOS 7, and then it started flashing the apple logo for probably two hours or even more, so i let the battery die out overnight, the next day I plugged it back into my computer and it had the charging bar for a couple of seconds, but after that the flashing started again, then i tried to turn it off and recover it, i held the lock and home button as it says on the applesupport website, but now it won't even turn on, it's not flashing, but even though it's connected to my computer, my itunes doesn't read it nor does it even turn on.

This site has alot of good answers to your question: http://allabouttech911.blogspot.com/

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