So i have an iPhone 4 and it got water damage, so i opened it up and replaced the battery, pretty simple. Or so i thought. When i turn it on i get a glimpse of the apple logo before the screen goes black. It gives the beep when its charging but wont show any display. Every now and again ill get a blink of the screen but then its gone just as quickly as it came. Any help would be greatly appreciated. Thank you.