pellis1309, make sure that your dock connector is clean of debris i.e. lint and that there is no corrosion. Also check the pins and make sure that there is no bent ones. Charge the battery on a wall charger first and see if that works better. it does provide more amperage than your USB port. It is possible that it is stuck in a recover loop and I usually use iReb for those. You can download it from here. Give it a try and see if it kicks it out of recovery. Of course make sure that you double checked, or in your case, triple checked your work. You should also try a new USB cable, just in case... Good Luck