My iphone 3g shows the apple sign then shuts down?

I dropped my iphone 3g and it only shows the apple sign for about ten second then shuts down. The problem is it only does it when plugged in. It is jailbroken with WhitedOOr7 and i don't know what to do?

Cables loose on the inside or not plugged in correctly. Take to repair shop or just fix yourself. Hope this works for you
This is how to open phone

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