Sounds Like the dock/charging port. first try a different charge cable. I have also changed the battery for this fix . check the pins on the dock port bottom of the phone if they are damaged from inserting the cable upside down you will have to replace the port. www.westar.ca.
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If your phone is dead, that means you need to charge it. Once you have charged your phone for a decent amount of time and have a pretty sufficient amount of charge, you can try to turn it back on. If the phone STILL does not turn on after having charged it, your phone is probably just burnt out. The iPhone 4 software is a bit more outdated now. Many people are complaining of technical issues. Things just wear away over time.
After the phone has turned on when you plug it in, you can turn it off. So, plug in the charger, the phone will start charging and turn on. You can then leave the charger plugged in, but just turn the phone off and leave it charging.
If your phone won't turn on, please try to charge it and then turn it on. If it turns on, then it means that the battery doesn't have a charge. If that's the case, plase charge it for a few hours and remove it once the battery indicator says that it's full. Otherwise, if the phone is still not turing on after charging it, you might need to replace your battery.
First try drying out your phone for a day or two with lots of dry moving air gently blowing past and around it, the phone must be unplugged and battery removed during this process, then once everything has been dried try charging the battery in another phone just like it, if it charges and see it it will power the phone, if the battery works put t back into your phone and try to turn it on. If it doesn't work in your phone but it does in another then its the phone, if the phone works with another battery its the battery but dry them both totally first, even a few tiny specs of moisture can screw up your phone when power is running through it, so be careful. Cheers!
you simply fried your battery by overcharging it. Just get a new one, let it fully charge and fully die twice before you start normal charging. Then you will want to only charge it for about 2 to 3 hours or find a charger that has a smart chip that tells it when to stop charging once the battery is full.