I just replaced my battery on my iPhone 5s. Everything seemed to go smoothly, I made sure all connections went back in snugly but now it won't start, I have it on the charger, maybe the battery was not at all charged to start with? Surely after 15-20 minutes I should've been able to start it. It just showed the white screen with the apple logo for a few seconds and then turned black. I can't seem to revive it at all 
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