I replaced battery, phone not booting up, blinks off/on apple symbol
Apple iphone 5 went dead, I replaced battery, it powered up to login screen , the battery charge indicator at 25%, started to enter security code and screen went blank. Plugged the phone in to charge and the apple symbol appears on screen then disappears for a few seconds then reappears in a cycle of 9 seconds appearing and 3 seconds black screen. I am looking for the next diagnosis step. Any help is greatly appreciated.
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