Why is my iphone 4 stuck at the starting logo after jailbreak?

I jailbroke my iphone 4, but it ran out of batteries, (my iphone has a really short battery life before jailbreaking, I think I need to replace my phone) So it's stuck at the logo. I tried holding the sleep and home button and then holding the home button, but it said it's low on battery although I've been charging for a long time. When I charge it into the wall the logo shows up automatically.
 
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